Home Theatre with car subwoofers

I was looking at an amp around the 400 dollar range but my search has yielded no results in going to best buy, circuit city, PC richards and a local HT store. in speaking with 1 worker he said that i would need a 5.2 system as opposed to a 5.1 since i wanted to hook up 2 woofers. Why can't i just find an old school amp with speaker wire inputs as opposed to the new amps that are all RCA jacks for 1 woofer. I know i could splice the wires together but that would half the power to each speaker. The Hi's i'm not so worried about i have some around the house that i can use and they are decent.

It would be speaker wire if i came from the box directly to the amp i want to purchase. It would be rca cables if i went from the box, to my old car amp, then to the new amp. I'm trying to find the easier and cheaper method to achieve my goal. i was told that a small AC/DC converter would power the old car amp but i was extremely skeptical. here's the product specs on the converter :

Travel Mate, 6.0A, AC/DC Converter, Instantly Converts 110V AC Current Into 12V DC, Operates On Standard Household 110V Current, Auto Thermal & Overload Shutdown, Extends The Convenience Of Your 12V Devices, Plugs Into Any Standard 110V AC Outlet.

i figure it is to good to be true that something that would cost me 20 bucks could solve my problem

http://www.pioneerelectronics.com/p....html?compName=PNA_V3_ProductDetailsComponent

I have 2 of those it's rated up to 500 watts at 4 ohms. I knew that guy at best buy was a moron. I wish i still had my old job so i could get all this stuff really cheap instead of going through these stores. I have an old 300 watt amp laying around the house so i think i'll try to just hook that up to the speakers directly and see if the bass hits and if it works i'll scrape up some hi's. Thanks a bunch for the fast replies and help Kiwi i appreciate it.