Well I have followed this forum for quite a while and have finally decided to post my findings.
I have the Asus M2N-e and have had no problems EXCEPT the reboot issue, which has now been 100% fixed for me with the new 0402 BIOS. The board performs well an overclocks better than any of my previous nForce boards.
Overall, I believe that most problems people are experiencing are due to either older Bioses, or the RAM that they are using.
My configuration is (passes Prime95 tests):
Asus M2N-e v.1.01G
AM2 Dual Core 3800+ @ 2.6GHz (9x290), auto Vcore (auto gives 1.45v)
2x 1Gb Samsung DDR2 533 @ 772MHz (533 with 290 o/c) - 5,5,5,15 1.90v
2x Seagate 320Gb in RAID 1 mirror
Forsa 7900GT o/c to 1.5v @ 665/900 with Zalman vf900
Creative Audigy 1
Coolermaster Realpower 450w (in Thermaletake Tsunami, lol)
Gigabyte ED821LC CPU fan with AS5 grease
Some things I set in the BIOS to help with stability of the o/c are:
PEG Disabled
HTT 3x
1.9v mem
Mem tREF 7.8 (instead of default 3.9)
Ram timing to 2t
I will check my BIOS again and edit anything I may have missed.
The above config scores approx:
19000 CPU score, 7200 mem score in SiSandra 2007sp1
11100 in 3Dmark05
6200 in 3Dmark06
Some quirks I noticed are:
-I cannot get 9x300 without increasing Vcore to 1.5, but I think that's the CPU not the boards fault
-The M2N-e sets a higher Vcore than you select in the Bios; if I select 1.5 it hits up to 1.55 according to Asus Probe
-If I make certain changes in the BIOS such as RAM timings, the first reboot may be unsuccesful, but turning the PC off and back on gets it going fine and passes Prime 95 tests
I sometimes wish I had got Core2Duo instead, but frankly the M2N-e is packed with extras that only AU$300+ Intel boards have, such as 5 fan headers, RAID etc.