To power the interior speakers I went with the US Acoustics USX-4065 4 channel amp. This amp feeds each door 65 watts RMS. For the features, Specs and price this amp is great.
Pushing the sub I have another US Acoustics amp the USX-2100 bridged putting 300 watts RMS into a single 10" sub.
The subwoofer is a Rockford Fosgate 10" HE2 (800 watts max)enclosed in a Virtual Technologies single 10 box.
Finishing out my install is Lightning Audio 4 guage wiring from the battery into the distribution block and 8 guage into the amps. To handle power concerns is a 1 farad lightning audio strike cap which should handle up to 1000 watts. Since my system is rated st 560 watts total this is more than enough.
Im seriously considering getting rims for my Avalon but Im having trouble deciding. So if anyone out there has any suggestions let me know. I'm thinking more like 18"