for starters...sounds like you talk to autobarn people too much...the only time they should speak is when you ask for a price...thats it...they try to put accross the image they know lots but they dont...(learnt from experience, and no, im not happy with them)
if this guy wasnt from there, well, he still doesnt know much and shouldnt be giving advice.
my 2 cents..
i recommend an oddessy. it did me well - 2 10's, 2amps, 2 sets of splits (all average power ratings) and it showed no sign of power loss ie. lights dimming while running. just make sure you use good wires/cables and connect everything well...solder the wires, dont just twist them.
basically in stereo terms, you get what you pay for, just shop around to make sure you arnt getting ripped!
optima's are very good, but maybe over kill for your system (your own choice) as long as your alternator is in healthy condition!