Hi all I am new to HT. I'm looking for a dts or thx preamp for around $200 bucks. I have been looking on some of the bidding sites, but I don't know whats quality hardware.
There's no way on God's green Earth you're going to get a pre-amp for $200. Unless you find some doofus who just wants to get rid of his old equipment.
The cheapest full pre-amp (not just a simple decoder) so far will be the upcoming Outlaw Audio Model 950 at around $900. In fact it's a 7.1 surround product, not just 5.1. Fully licensed DTS-ES and Dolby Digital EX plus Dolby ProLogic II decoding.
You then need one or two more speakers for the center back surround outputs and an amp(s) to drive them.