best amp for 200

You want an amp that makes some ~1500 watts that is well known, respectable, reliable, and costs $200?

Good luck with that.

Sure but that isn't how you phrased your question. 

The bottom line is that 200 is a pretty tiny budget for a sub amp - if you could get that to 3 or 4 you'd have a zillion decent choices.

If I absolutely HAD to purchase a budget sub amp -

http://www.cadencestore.com/ProductCart/pc/viewPrd.asp?idcategory=125&idproduct=380

I stress the word 'budget'

Wow congrats - I'd rather have my own home than a fancy amp anyday.

Now a wife or fancy amplifier - that's a lot tougher.

Anywho - earthquake amps look pretty cheezy - IMO the best rule of thumb is

http://www.earthquakesound.com/tnt.htm

"If the amplifier specs mention "max" or "peak" power - don't buy it"

On the other hand, the equipment doesn't look expensive and you said you like the 4-channel - go ahead and purchase it if you feel like a low budget solution is right for you.

I think most people here would tell you a REAL couple of hundred watts or so would be more desirable than these other options, including that budget Cadence I linked to above - you're still pretty constrained at $200 though.  I'd much rather have a modest, high-quality amplifier than a hifonics or a earthquake - or heaven forbid a sony or pyle or something.

http://www.woofersetc.com/index.cfm?fuseaction=product.display&Product_ID=249

All I got for ya.

I have to agree that anyone would be hard pressed to find a good amp at the $200 limit that would be able to put out that kind of power! Of course, I completely understand your budget situation so check this amp out:

http://www.online/CarAudio/ProductDetail.aspx?Productid=19341

Definitely a "decent" amp putting out plenty of power for your subs and it's under your $200 budget. How do you like them apples?