Hello all,
First off, great site and great advice from what I have read so far here.

I am a newbie here although I have had an entry level home theatre setup for the past 10 years. I use it for DVD watching (75% of time) as well as CD and radio listening (25%).

It is currently...
Kenwood Dolby Pro Logic 7080 receiver (bought in 1996.. not dolby digital)
Infinity CC-2 center channel
Bose 301s as fronts
Small basic speakers as rears
A/R S108 subwoofer

The setup has suited me fine except now I want Dolby Digital. Thus my questions are...

1) Do I just replace the receiver (looking at Pioneer 815 or 1015 or similar one around $400) or do I buy a home theatre in a box (e.g. Onkyo HTS780)?

2) Is the fact that I am using different brands as my speakers a bad thing?

3) Would a HTIB similar to the Onkyo really sound better than a new receiver and my current 301s? I can't imagine a $500 HTIB would sound as good especially when just the speakers alone in my current system cost $300. I can't imagine blasting my CDs through some of those speakers that come in the HTIB like I do with my 301s...

Thanks in advance!