I may be new to the VX game.. but i know a thing or two about car audio.... Use to work for
Mobile Soundwaves when i lived in atlanta...
Alot has to do with your type of music... But.. for the best all around... 12's tend to be the most popular. 15's give REAL good LOW bass.. but not so good in everything else.
In my RX7, i had two 10's, and was very pleased with the performance. But it was a much smaller car.
My BMW had one 12 in a ported/wave box.. and it beat... it sounded great.
As far as brand.... I was a DIE HARD JL Audio fan. The arent cheap.. but they are the best IMO.
Another good company, believe it or not is the new MTX line. MTX REALLY sucked there for a long time, but they are "re-born" as of late. There Thunder series are great. the 9500 is just a beast... Kinda over kill in some cases. So you might want to look in to the 7500 and 8500's.
Those are just two brands that i was impressed with. There are TONS of great brands. Dont get sucked into cheap sub that hit REAL good ( i.e MA Subs) They sound damn good at first... but they arent constructed very well. But they offer great warranty's.. and you can return em, and they will just send you a new one, pretty much no questions asked. Same goes for JL and MTX.. they just dont have alot of returns, due to the better workmanship.
If you have any questions, feel free to contact me.
WakeBorder1@aol.com, or you can IM me on AOL at the same name.
Just trying to be as much help as i can being the new guy!
KB
P.S.
Sorry for typos.. to tired to spell check.