Few questions...
As for specific brands and models, you should read the hundreds of posts on the subject or do a search on the brand you're interested in. Opinions vary and most will recommend you listen to each and decide what you like best.
I would also avoid big box stores for your install. Find a reputable shop if you can't do it yourself. I would also not buy from BestBuy because they are evil.
Look at subthump.com for perfab sub boxes built specifically for 4th gen birds. This is a much better option than trying to drop a generic box into the trunk.
Happy hunting





