MB Quartzs vs jl audio subs

MB Quartzs subs vs jl audio subs which brand is better i need two know also i have a choice also with diamound audio subs all around the same price they are 12s and i will try to get model numbers so you guys know what iam working with

I have a complete 12" pro series titainium Subwoofer stereo system. 2 12" Titanium Polk Audio Subwoofers incased in carpeted box tuned to 33 Hrz, it pushes 128 SPL's with more than enough power cable and conections 8 guage wire. A JL Audio 500/1 Amp Running the Subs. All Gold conections. for 600 bucks or i can get 2 jl 12W0's. or 2 12 MB Quartz subs   with a alpine amp MRV-T320 for $300 these are my options right now whitch would you go with iam leaning towards the jl or mb quartz choice due to low funds but dont know whitch subs two pic

also i was oferd this 800 WATTS KENWOOD AMP YEAR 2005 AND 12"BOSS 450 WATTS EACH SUBS AND BOX. I AM SELLING MY AMP FOR $100 AND MY 12"SUBS FOR $100

I'm confused, you have or you are getting a JL500/1? It is far and away the best amp you mentioned. I wouldn't mate Polk*anything* to a JL amp, try a pair of JLW3's instead.. you ought be able to get a pair of those for $300. "I'm finished!" - Daniel Plainview

i dont have an amp or subs i just posted what pepole are trying to sell me

I'd say all those subs are pretty comparable.  What are you matching it to?  And how much power to the rest of the system?  If it's a lot, I'd recommend the JL amp & the w3 JL subs - big difference.  If the rest of your system is 30-50 wpc, the alpine & JL w0 subs would be my pick.