I never felt a huge urge urge to try anything boutique or anything...
Holier grail: Meh. Big and super underwhelming.
Biyang Triverb: Impressive, especially for the money. But noisy as hell, and I can't vouch for the build quality/reliability.
Hardwire RV-7: No complaints what so ever, ridiculous price-to-awesome ratio. It actually makes me now wonder about the digitech Polara.
Digitech digiverb: Yuck. The mix controk is retarted, doesn't work like it should.
Personal favorite: RV-3. Keep coming back to it. Stereo reverb AND delay in a small package. Reverbs that are just gritty enough and not too p&w-ish clean or dreamy, and crystal clear delays that cut through a mix like...Well, like a digital delay

The lack of control over the reverb parameters is a shame though, it's the only thing that makes me look at other stuff. Too bad the Avalanche Run costs way more than what I can justify, not being in a postrock/shoegaze band and all...:/
Also: Too bad there's no pedal version of the Alesis Nanoverb
