what kind of subs u you like depends on what kind music you like or how your music is played . . . my top two choices are usually the kicker sola barics or jl's. kicker's are more aggresive sounding, during bass lines the kicker's will give you more bass than the actual song, which is great for hip hop, electronica . . . . however i really like jl's because it is a very accurate sounding sub, it plays the song the way it is meant to be played, if i want more bass i can use the head unit to adjust . . . . . also when it comes to systems, dont half ass it, you truly get what you pay for, but thats if your ears can tell the difference in the first place, i have friends that cant hear the difference between an $10,000 audiophile system or a budget $300 system