nothing wrong with your PRS and pedals are worthless without a good amp that's voiced well for your pedal choices.... not all pedals sound good through every amp
In your price range I would go on the web and buy a used Vox ac30HW2, but I am a total AC30 guy. It can do everything but the most modern metal styles and its built like a tank. Half power mode and useable PPIMV make it great for any size gig. Takes pedals well but also produces the classic ac30 overdrive and then some. "Hot mode" can get you into Brian May turf and beyond with no pedals.
Also check out Ceriatone.com, Nik makes some really winning clones. I own one of his Matchless clones, great amp, build quality is first rate apart from a few dodgy bits of hardware like the non-welded cassis and cheap fuse holder and jacks. He does all the classic marshalls, tweeds and boutiques you can think of all at great prices. His Marshalls really are standout clones at a good price, especially the 18 watt clone.
If you want some coin left over for pedals consider a blackstar or something from the orange terror series.... if you only need one channel of modern drive with a small wattage footprint I quite like the Orange OR15 head you mentioned, but it offers little in the way of cleans. I also seem to remember being taken with the Fender Supersonic amps a while back, but modern PCB fenders make me worry about reliability. Those amps have a lot of features to break. If you want affordable switching of 2 very distinct channels with a very modern voice look no further than Mesa's 90s Dual Caliber amps. They are not precisely my cup of tea, but I felt they were Mesa's best offering up until the Electradyne (which is probably out of your price range). You can never go wrong with a Fender Deluxe Reverb if you use pedals or just need a great clean tone at small gig levels. Did I mention the handwired AC30 yet? I did? Well, go try one and be amazed. If you scrounge you might be able to find yourself an old 50 watt JMP with master volume or a 50 watt JCM800. These are Marshall's most versatile amps ever and they just excel at everything under the sun. The RI is only of the less toneful and overly loud 100 watt 2203 model and you pay more for an extra 50 watts you will never, ever need. I miss my 50 watt 2x12 form '81. The prices on these have jumped dramatically in the USA, so I don't know if you could afford one on your budget. The Buddha superdrive aps are really cool and worth a try. Not my cup of tea, but if you like the OR15 then the superdrive 18 watt model will school it and provides channel switching (I think, its been awhile). I should again mention the VoxAC30HW, it is great.
and check out this list of Aussie builders doing handmade stuff (support your local amp gurus!):
http://www.guitargear.net.au/discussion/index.php?topic=2009.0
Pedals.... you can't go wrong with the MXR Custom Badass overdrive, the little gold guy. Its a TS9/SD1 affair with better voicing, 2 modes, and a bass control... it is CHEAP and great at what it does. All of EHX's new overdrives are great, but in the TS9 camp I prefer the MXR Badass I mentioned to EHX's Green River drive. I have a soul food and like it sometimes and I also was quite taken with the log drive and that other one that sounds like a fulltone OCD for cheap. MXR's BC108 silicon fuzz recreates the band of gypsies era Hendrix fuzzface tone on the cheap and I like it. If you've never tried a big muff, EHX has lots of affordable options now. It may be way over the top for you, who knows? I never got too into it though I have owned dozens of muffs from every era as well as lots of tweaked clones. The proco rat is a classic, affordable distortion unit that I heartily recommend to rockers. EHX's smalls tone is my favorite phaser and I think MXR's current analog chorus is one of the best sounding chorus pedals for the buck right now. I also like the Ibanez CS9 reissue. Sounds pretty solid and is affordable. I love the old EHX small clone chorus but its hard to come by and the new ones suck.Analogman makes an improved clone of the small clone, but its pricey. The discontinued Boss BF2 flanger is still the best deal in generic flanging though as with the CS9 I am not in love with the buffer.
also think about investing in a new cab or at elast get some decent speaker in place of the OEM marshall junk that comes in AVT's
That's all I got....