Thanks for the advises. After some additional listening on the store demo walls (duh...), I narrowed it down to Rockford, Alpine, and Sony. I also found out that the 4 x 50W-ish amps from these brands can be had for less than $150 if you do NOT buy at a B&M store (man... they will gauge you!). Since I've found a local shop who is willing to install the gears that I bought elsewhere without penalty, I ordered a Sony 4 x 60W from etronics.com. No strong reasons for the Sony -- It just looked to me like better-built, and bigger for the power spec. hahaha... It is on the way together with the Infinity speakers now!