Jackson,
I too have the 8443. I purchased it from Tweeter after about a month of debating over "what I am really going to gain from it". I am very pleased with it's performance. Personally, it was the best thing I could've done to improve SQ in my car for the money. However, the only drawback I've seen so far are the fact that the owners manual is a small novel, and that they seem to have had some reliability issues as of late. In the past month Tweeter has had 3 returns because of faults including mine. My HU refuses to read cd's. It's been over 5 weeks now and still no HU. I'm not so sure it's Eclipse's fault though. Tweeter decided to drop the Eclipse and maybe that might be affecting the way Eclipse sends it's replacement parts to them... I don't know. So... I start looking for another HU. I find the 9835. Nice unit, very nice. About $130 more than the Eclipse... Here's what I've had a chance to find out about both...
Alpine - Nice looking unit with a very nice display. Cool graphics(not really important to me), Ability to read all formats, 5 band adjustable EQ, changing display colors(hell, if you want pink you can dial it in!), 4v pre-out - important in the fact that Alpine is the 1st company that I know of that is using the 2006 CES standards for measuring(kinda like max power vs. rms) so perhaps it won't suffer from the "Alpine" low bass volume, so on and so forth.
Eclipse - Not as flashy looking but it gets the job done, 1st display that I can actually see when the sun is on it!, probably just as many functions as the alpine in terms of sq adjusability, Parametric EQ - here's the kicker, not only is it a adjustable 5 band but it's also adjustable for low, mid and high.... so essentially a 15 band EQ, 8v pre-outs - note... It's 8v at max. My HU started distorting at volume level 74 of 80. And the measured pre-out voltage was clean only up to about 5v., 55ohm output.
My thought's - I like the Alpine but a couple features steered me toward the Eclipse. It does have a slight output voltage advantage over the Alpine.. so to fend off any unwanted interference that extra bit helps. The Parametric EQ was 3x more adjustable than the Alpine's. But the real deal maker was the fact that it has a 55ohm output. What that means is that the signal coming from the HU to the Amp is "virtually" un-impeeded. No other HU out there that I know of can come close to that.
If you want to spend alot more money you'll be looking at copper chassis, no internal amp, and possibly fiber optic. But IMHO the Eclipse is the best "analog" HU out there.
Hope this helps...
Jack
Eclipse 8443
Boston Z6
JL 450/4
Alpine Type-X 12's x 2
Alphasonik PMA1200D