Well, for a 925 to be at 3800 MHz you'll need 270 HTT. Unless you (can) lower NB multiplier, that translates to 2700 MHz NB which may or may not be attainable on air cooling. If you're using DDR2, they will need to clock to 1080 MHz. (You can use lower dividers, at the cost of performance)
For $25 more (955), you get faster stock clock as well as total freedom of multipliers which now works w/ C'nQ.. I think it's a no-brainer.