yamaha and klipsch are a good match. the sound of yamaha does well with klipsch, for entry system look at the rf/32 rb/32 rc/32. I think that might be a bit more speaker than your willing to buy, so potentially look at the rb15 series stuff. I sold the stuff for a long time. I've worked for klipsch. That amp you have i would recommend klipschs entry level stuff with it, but dont waste your time with the best buy klipsch stuff. go to a small shop, have them throw you a good deal "ask for it" klipsch is a 40% product, meaning 40% margin, the samller stores will sell it from 30-35 no problem, if you can hit 30 taKE IT. HSU makes a good sub, i'm not keen on klipsch subs ( too boomy) I would pick up a paradigm sub if you can swing it, pdr8 is around 350, figure 50% margin, so if you can get $250 thats a fair deal. don't neglect your cables. You don't have to do monster, but don't let anyone trick you into thinking they don't matter. finally get a decent power filter. monster makes a good one with what they call power stage 1 for about a $100.
have fun, msg me if you need more help.