Most of that list looks pretty good so far.
I have a 7XL and a Quark 125 in my E-maxx running 12 and 14 cells (I like 14 alot better).
So far, after about 20 packs through it I have not broken any drive train components. I did burn out the Quark some how, but it was replaced straight away. I bought pretty much all my stuff from rc-monster and I think you'll be happy if you do the same.
The drive train upgrades I did were:
2 sets of
http://www.rc-monster.com/proddetail...mip1525&cat=47
but I think the UE ones you listed would be better.
You could try using them only in the back, if the stock fronts keep braking you can always upgrade later.
Aluminum Diff Cups- $60
http://www.rc-monster.com/proddetail...LM13010&cat=31
I don't know how much different these are to the Maximizer 7075 ones(I got them because they were cheaper)
Center CVD set- $46
http://www.rc-monster.com/proddetail...mip1495&cat=47
Mine haven't broken yet, but the pin kept coming loose and put a coin slot in the stock chassis (yes I used lock tight). If you file a flat spot on the pin where the grub screw goes it seems to stop that.
The UE ones you listed will not work on a standard E-maxx, they are for a T-maxx (one is longer than the other), they will work on some extended chassis though.
2 Hardened steel idler gear-Emaxx transmission $30
http://www.rc-monster.com/proddetail...03idler&cat=47
If your using nimh's I've heard IB4200's are some of the best.
Quark Monster Pro 125B Brushless Sensorless Speed Controller - $280
http://www.rc-monster.com/proddetail...RK_125A&cat=21
Very smooth controller. I don't know why mine burnt out before. My car is playing up now and I'm not sure if it's an ESC thing, a battery thing or conections, it's very confusing and frustrating.
I use the UBEC and heatsink that BrianG listed and am happy with both.
I haven't had any experience with the Neu motors, but I have heard only good things about them. The Neu's are 4 pole, but the Quark will run them. 2000kv sounds good for 14 cells.
If I was getting a Neu I woild get this as well
http://www.rc-monster.com/proddetail...od=RCMNEUcover
Strobe Slipper Kit w/Bearings - $32
http://www.rc-monster.com/proddetail...od=Slipper-Kit
With...
Nylon 51 tooth spur gear - Ofna - $7
http://www.rc-monster.com/proddetail.php?prod=ofn30110
I would use about a 14 or 15t pinion, with the ofna 51t and Neu. Depends on what your car to do.
I think the Neu's are 5mm shafts (check with someone else though), so you can use the 5mm bore, mod1 pitch pinions found 2/3 down this page.
http://www.rc-monster.com/gears.php
I haven't heard about using bearings as friction pegs, but I'm guessing the strobe will be better.
Differential Case - $50
http://www.rc-monster.com/proddetail...iffcase&cat=47
Sorry if any thing over laps with Brian's comments when I started typing his post wasn't ther yet, and I'd gotten too far to stop.:005:
Patrick