Edit: I've also been seeing the 4065 regularly on eBay for even cheaper than Crutchfield's price.

Exactly. There are a lot of really good, highly rated amps for less than $200 (4x75). One example is the Autotek amp. It has received extremely high marks in the trade and consumer publications. Their specs are great and you can get the "Street Machine" series in the $150-$175 range (4x75). Certainly there are others that are equally as good.

IMO, Crutchfield has great customer support but their prices are sometime 2x what you can buy the same thing for on e-bay.

Look around. You'll find all kinds of opinions. The good news is there are many excellent choices that won't break the bank.