NHT (Now Hear This) is a brand. I actually auditioned the said system here in Manila with the Onkyo Receiver and I'm really impressed. Check out some reviews here
http://www.nhthifi.com/n-reviews-home.html
I currently have a Marantz receiver driving a Wharfedale speaker system (available ni cya sa Circuit City) and so far, so good. My dad has a Yamaha (driving a B&W 6 series system) and an Onkyo and nindot sad. Actually, you can't hear the difference unless you have a very nice set of speakers (like a Martin Logan or a B&W 8 series or a Wilson Audio)
Get a decent speaker wires and interconnects (Monster cable will do). I'm using AR (Acoustic Research 100 pesos per meter, i think).