go with two JL 10W7's if you want crisp loud clear niiicce bass, they're the best. two of those with a 750/1 jl monoamp each will shut down someone with 4 shitty kicker 12s, and would sound waayy better too. actually would shut down 90% of the setups out there except for the serious competition ppl
go with a couple of 18" Fi BTL's if you want to shake the pictures off of someones wall three blocks away, blow out your windshield and back windows, and get disturbing the peace tickets. for that you'll need a couple of 2000 watt rms amps for each of them if youre even remotely serious. you'll also want an alternator that puts out 300 amps or more, and a high quality deep cycle battery otherwise you'll fry your alternator real fuckin fast
actually, both setups will fry most alternators real fuckin fast. and both set ups are going to need some nice component speakers or other high quality speakers for the highs or mids which are going to need their own amps too, if youre even remotely serious about it sounding good.
You asked for the best, imo those are the best two setups. theyre my dream setups at the moment. theyre also going to be at least couple g's for either one.
youre going to need at least 1/0 wiring which is about as fat around as fifty cent piece, lol. good luck