I put together some speakers for my computer recently and now I need an amp or receiver to power them. I wouldn't mind if it was only a power amp since I could use my computer for preamp functions. My big requirement is that it be small so it doesn't take up much desk space. Another requirement I have is that it be quite inexpensive (I don't mind used or whatever). One from a shelf system that had adequate power would be great (such as: http://www.circuitcity.com/ccd/productDetail.do?oid=64934&WT.mc_n=4&WT.mc_t=U&cm_ven=COMPARISON%20SHOPPING&cm_cat=GOOGLE&cm_pla=DATAFEED-%3EPRODUCTS&cm_ite=1%20PRODUCT&cm_keycode=4 ), but they're hard to find separate. Any recommendations? Thanks