I don't know about the amps, but NVX brands some really decent components. The X series is made by SEAS if I recall correctly. I also have read good things about the PPI phantom lineup of amps, but I havent played with any myself.
OP if I had you're budget and stuck on buying new I would probably focus my efforts on Harman-Kardon products for amps and cheaper components ie Infinity JBL etc. Personally I've always preferred seperate mids/highs and a monoblock so a 2 channel and mono would be ideal in your case IMHO.
Budget subwoofer I personally like Alpine maybe a type s or r if budget allows it.
Wire: Whatever true AWG OFC you find that's the cheapest.
Deadener: Knukonceptz or Sound Deadener Showdown (Expensive, but I've had decent result with minimal coverage.)
Box: Build it yourself if able.