Well for pedals, I haven't tried a lot (most of my reverb is rackmounted), but I do like the Eventide Space quite a bit. While there are a good number that I haven't tried, the ones I did try paled in comparison to a good rack unit. The Space came the closest. I've heard great things about Strymon and Neunaber.
For racks, I really like the Eventide units (H3000DSE, GTR4000, Eclipse) and the Lexicons (LXP15-II, PCM81, MPX1, PCM92). I've heard great things about Bricasti.