If you want my advice (for whatever its worth) then read on. If your mind is made up to buy the junk squire and hope you can get some of your money back on her later then stop readin' NOW:
If you can't afford exactly what you want today, then save until you can. Unless you just got hired as a sideman and the gig demands a J-bass of ANY kind then its foolish to be in a rush. There's no guarantee you will get good resale or trade-in on anything you buy, ever, but going with a stopgap student instrument is a really risky proposition that will likely see you tossing out a lot of your hard earned money if you decide to trade up at a time the market for cheapies in a slump (as it often is). An MIM standard J Bass will give you a relatively stable resale or trade-in when you want to go USA deluxe later.
Or (and here's what I would do AND HAVE DONE) open a high interest savings account with powerful withdrawal and balance restrictions and put all your money in there and keep adding to it, hopefully the interest rate will cover your sales taxes assuming you are good about not withdrawing any funds until you are ready to close her and buy that USA deluxe bass....
I am a big fan of locking my extra income up this way when I want to save up to pay cash for a luxury item or even just create a rainy day fund...
In the interim while you are saving you could take a 100 euros or so a week and begin to customize your beginner bass a bit with pickups and caps/pots... set her up right (your no-name bass is a great instrument to learn set-up and electronics work on since fucking her up a bit is no loss and once you have it all down you can start charging people you know to work on THEIR gear putting even more cash in the American Deluxe pot). You could fund some of the mods by donating blood every week to the red cross and still put much of your earnings away apart from rent, utilities and a few bucks for beer, smokes, munchies... tighten your belt across the board to facilitate more effective savings (I once cancelled all my utilities but electric and water for a few months and got rid of my car to save on parking and insurance just to cut my living costs and start the nest egg with the car sale proceeds... I got up early all spring and summer and walked across center city philly to work instead of driving or paying for a train or cab... I was never home anyway then and when I was I tried to barely use the utilities other than to shower before work... I literally paid a minimal electric and water bill, sued the internet cafe's wifi, paid rent and bought some food here and there... I even quit being a pack a day smoker cold turkey and just scammed cigarettes off of coworkers, friends and clients whenever I could LOL! I am an accomplished home cook and I would invite people who could not cook over to dinner on the grounds they brought ingredients and alcohol. I would do the work and serve a great meal and get to eat it myself AND get nicely wine buzzed in exchange for a little cullinary work I found to be a lot of fun. These days I make lots of besoke toddler meals for a picky sprout at my own expense. You tell me what lifestyle is crazier. Anyway this period in my early 20s after art school was the basis of my gear collection really and that nest egg of self-denial really is why I can always buy, sell and trade gear pretty easily as a hobby... as a 35 year-old-single dad I could not manage such a bare bones existence, but there is a time when you are young enough to live like a bohemian squatter and if you are passionate about music and gear then that's what you need to do... you will get equipped from instruments to amps to a van for the band and maybe even a budding homestudio for when you are ready to spend on electricity again).
