The P-90's in the Epi are pretty good for a thick, almost jazzy sound. Not contest compared to the PRS though! hehehe The Epi is bad about feeding back due to being semi-hollow but it feels real nice because its so light and the neck is perfect for my hands.
The Echoplex is not a tube driven one. The store I bought it at was selling the transistor ones for 400-430$ and the one they had with tubes in it was almost 600$! I love the analog sound but that's too much for me. Yes, I play it all the time, it's awesome for any kind of lead or intro/outros. Using it with the Digitech PDS-1002 makes an awesome sound that drives my neighbors insane! hahaha, You'd be suprised how many times the police have come out here to tell me to turn it down.
No, I usually keep the PRS in it's case but when I have friends over to jam I keep it out for easy access.
As for the Twin Reverb....IMO it's the best amp for any clean stuff. It's certainly one of the best amps ever made if you judge it by who plays them. One of the reasons I bought it was because so many rockers have used the Twin Rev. on so many of my fave albums. I highly recommend it if you play clean stuff...if not, then Mesa Boogie gets my vote for the best distorted amps.
Next on my want list is a Sunn Coliseum amp, M/B Road King, and maybe some Death by Audio pedals. I've never tried them but the samples on the Death by Aud. website sound pretty cool.