If you like the shoes you use for spin classes then get another pair of them and use them without cleats. For pedals I recommend one of these (or you can get the same designs on ebay for less...just search for "wellgo" and compare the pictures):
http://store.velo-orange.com/index.p...ts/pedals.html
Clipless pedals do not make you go 2 mph faster. That's a myth that's been debunked many times by scientific inquiry...although they might give you more confidence to ride harder without worrying about your feet slipping off the pedals. It depends on what is more likely to kill your confidence: fear of feet slipping off or fear of feet getting stuck.