Listen up:
You people only say Kicker is no good because it's "mainstream" like a bunch of immature highschool kids hating on whatever their parents are into, keep in mind that Kicker's been around before some of you were even a sperm in a sack. Your internet brands are either copycats of each other or ones that hire someone else oversea to design for them, they're all made in China/India/anywhere besides USA but most people aren't going to realize that. Assembled in the US is not made in US, that disqualifies 100% of the internet brands from being able to say "made in the USA" even though some still do to get that sales pitch. You are paying pricy items to increase job security of someone oversea instead of a brand that have physical dealer stores in the US with employees living in the US paying taxes in the US and spending their money in the US, I hope you feel good about it. Oh and brands like Sundown/DC/SSA/IA/whatever can only dream to get a sales deal with Walmart because that's immense amount of revenue, but you wouldn't understand that either and probably hate it because "what a sell out durrr."
OP define "good sound", what is good sound to you? Lot of bass? Smooth frequency response and volume-matched to the mids and tweeter? I'm going to guess lots of bass because the new generation of car audio fans don't seem to understand good sound these days, "louder is better" and "fat bass to go with that rap or trap music." Anyway, a Single 12" CVX in a 1.6~2 cubic feet ported box tuned to 35Hz with about 500~800 watts RMS would be good. Don't get square Kicker subs unless you want more bass than sound quality. The L7 will be louder and go lower than the CVX due to extra cone area but will sound a bit sloppy, but some people like that fatty bass. Solo-X are beasts but again they are made to just get loud and low and can take 2000 watts RMS no sweat, but don't sound smooth while at it. The Warhorse is a stupid idea for OP because that thing needs as much electrical upgrades as any other 10,000 watt amp to run it correctly. Solo-Baric classics are hard to find (discontinued) and the original solo-barics and comp/compVRs are usually old and used up. I've used just about every Kicker series of subs, even the XPLs from the late 90s to the discontinued Solo-Xs. Anyone who say Kicker is no good are people with no experience in them.