the dbx 242. Harvey turned me onto these eq's and they are very nice. Orban designed, great sound, very versatile. I bought a mint pair on eBay for $250 shipped about 4 months ago and it's been a great buy.
I use a Urei 546 that I've had modified by Jim Williams of Audio Upgrades. Sounds great, and is wonderfully designed. Every engineer that comes in here is intrigued by it.
I have a couple of API 550b's that I think are pretty sweet.
My vintage Audix 35102 pre-amps have an onboard parametric EQ that's just about as smooth as silk.
Those are my only hands on experience with para-metric EQ's.