If you want to go over the top, I'll recommend the Subdecay Quasar DLX. It can do almost everything from subtle to over the top, you can switch between 4, 6 or 8 stages, etc... but it may take you a while to find a setting that sounds good in the mix. There are a lot of possibilities here. Mind that I'm talking about the V1, there is a Mark II out now which omits the stage selector switch. Subdecay claim they made it simpler to make it easier to sit in the mix. It's hard to find the Mk.I and over your current budget, but it's worth it.
If you want a 'one trick pony' / set-it-and-forget-it type phaser that sounds good with almost every other pedal, the HBE Psilocybe is a good bet. It sounds very good combined with dirt. I love it especially with the Darkglass B3K or the 3Leaf Audio (You're) Doom. I think they can be found in the $125'ish range if you're patient and not too keen on a mint-condition pedal, cosmetically.
Within your budget, the Phase 90 is a classic and although I didn't actually play the Phase 100, it seems people like it on bass. Both those pedals should be easy to find under $100.