US Amps I/S 4085 VS Eclipse EA4000

Greetings all!  I have had the honor of poring over the many informative posts (especially the stickies) for the last few days and increased my understanding ten fold.  I have especially appreciated reading the posts by haemphyst, DYohn, Steven Kephart, the12volt, and forbidden.

I finally feel like I have a pretty good idea what kind of an amp I want/need to improve my system.  Here is my current setup:

I think I have narrowed down the amp choices to the US Amps I/S 4085:

IS 4085 Retail is: $299.00.

Or the Eclipse EA4000: with a 2x30 amp fuse

What do you guys think?  How would you compare the two amps?  Are they right for my system?  Any other recommended options?  I am a little worried about the current I will be drawing from my stock alternator.  But according to the different formulas:  basslink 200 watt x 1.25 (class D) / 14.4V = 17.36  +++  75x4 = 300 watt x 1.5 (class AB) / 14.4V = 31.25     ===  48.61.  Might the remaining 21.39 amperes be enough to run the car's headlights (or air conditioning) and the many electronic systems?

I would greatly appreciate any diagnosis/analysis.  As far as wiring is concerned, I was planning on running 4 gauge from the battery post  (with an 80 amp fuse within 18" of battery) to a fused distribution block in the trunk.  From here the current will be split between the basslink and whichever 4 channel amp is decided upon.  They will both be grounded to the same bolt in the trunk.

Thanks in advance for your analysis!  I look forward to reading/participating in the responses.

-Matt

The Eclipse is $225 shipped and the US amps is $145 shipped.

I should probably mention that I am solely interested in SQ.

Cost is a factor, but definitely not the only factor.  I would prefer a well made amp that will last for years and supply my speakers with the power and precision needed to sound their best.  I am hoping for a big SQ difference by tripling the rms watts going into my speakers.  All the speakers are equipped with passive crossovers.

Any suggestions would be greatly appreciated.

Thanks for the advice forbidden and luckydevil!  I checked out the XA4000 and it looks great, the only problem I see is that I would be concerned about overloading my speakers with a 125 watt x4 channel into speakers 2-90 and 2-110.  Plus, even with the increased efficiency of the XA 500 watt x 1.25/ 14.4V = 43.4 amperes whereas the EA would be 300 watt x 1.5 (class AB) / 14.4V = 31.25.  So the EA would still be drawing less current.  Or am I performing the calculation wrong?  Should it be 300 watts x 2 / 14.4 V = 41.7 amperes?  Either way, does anyone know of a good class D 4 channel amp that produces a little less power? (such as in the 75-90 watt rms range)  Or would I be able to adjust the output power of the xa4000?

The I/S 4085 was an outsourced to Asia production model.  I am assuming the Eclipses are made in Asia too as they are made by Fujitsu ten.  I value your opinion and will definitely take it into consideration.  Out of curiousity, what kind of standard are the low end US Amps made to?  And what would be the main differences between the amps mentioned?

Thanks again!