Thanks for this helpful thread kidcongo!
In about 3 months, I broke these pieces:
-Note the 2 rear wheel axle (both are from the right side). I am worried about this because I have not seen anyone else with this problem and can't find some titanium wheel axles to prevent the damage.
I recommend to use titanium screws, especially in aluminum to aluminum and use longer screws in wing mount and rear stabilizer mount.
I take some photos to show you some of my tips:
1-Longer screws:
2-Protect the rear suspension mount:
3-If you don't like the double sided tape
4-If you must purchase a wing, I recommend the LMR.
5-Fredrik tower spacers improves suspension movement
6-Titanium screws:
7-Improve clearance using 3x1mm shim
8-Use two 0.1mm shims to prevent oil leaks:

For full size photos:
http://www.flickr.com/photos/9248112...th/8499791603/
I recommend to purchase a full ceramic ball set for diffs when the original ones fail.
The steering set is a good buy, no doubt.
No one has commented how good are the front WO universal shafts (yes, it is not cheap but I think it is a good upgrade).
In general, a spare of all plastic parts is important (arms, gear boxes, wing mount, damper caps, damper retainers and adjusters...).
If you broke the hex hub, i don't recommend to buy the #54406, better buy the original ones.
If you run in outdoor track, use durango boots to protect diffs (thanks to kidcongo for this tip!!),
This is a great post, I hope everybody give their tips and recommendations!
Best regards