If you are willing to get a flanger then forget about the most popular units which are available on market nowadays. Just get a HF-2 because it simply beats out: Boss (BF-2 / BF-3), MXR all iterations including famous EVH Signature Flanger, Strymons, A/DA, Ibanez, Maxon and any other flanger you know.
Yes, it's been hiding in Boss line since it was introduced and I often wonder how come Boss decided to discontinue it in 1995. I have the MiJ version from 1986; it is so warm, natural, lush, noiseless and tweakable. No other flanger does what HF-2 is capable of, really. It's not that expensive, too - I got my in mint condition for 50$.
Just bought it three weeks ago and i couldn't find a tone that i didn't love. It has a little noise and adds some colour to my tone but that's precisely what you expect to find in a analog modulation like this.