Advice on first HT equipment and setup.

First of all I am a total newbie when it comes to HT. I have been a two channel analog guy for the last 30 yrs. I have no intentions of dismantling my two channel system to make room for an HT system. My two channel stays on one side of the cabinet and the HT will be on the other. When I want to watch a movie my thinking is to simply pull the bananas from my L/R speaker (two channel amp) and plug into the HT receiver. I'm not looking to break the bank here...I already did that with my 2 channel stuff. Looking to pick-up a good used receiver and DVD player. I will also need a center and two rear speakers. My room is 16x24x8high. Budget $2500. Any and all advice would be greatly appreciated. Thanks!