<font color='#000000'>bunch of easy (or not) answers:
pre-amp normally is a separate piece of processor/line amp. This function is built-in in receivers.
by going pre+power amp, you have more choices/flexibility to tailer the system you want but much more costly vs. receiver in most cases. I personally will NOT go to that route because of performance/price ratio.
Here on Audioholics there are some very good reviews on receivers. You may also found more general reviews on www.audiogon.com and www.audioasylum.com.
Recommendations for receiver: go with Yamaha RX-V series, best bang for the buck!
just my 2 cents.
Abe</font>