[oldbittercraig]

"sneak attack is nice 16d additional damage.
3 rogue level is enough in my opinion

17 fig / 3 rog excellent idea"

Try going the other way. I have a 13th level pc- 10 Rogue (sorry, he's mascara free)/3 fighter.

He got the nice fighter feats, dual wields a rapier and sickle (it adds to his STR, glows, and does bonus damage... an odd, but effective, left hand weapon).

He has a lower attack bonus and lower HP than an equivalent fighter, but he makes up for it... like his sneak attack damage, which is up to about +5d6 now. I let the monk run in first, draw the attention, and start sneak-poking with my rapier. It's great fun and horribly effective- with the improved critical feat on the rapiers already high crit threshold, I strike as quickly as a sewing machine, but pump out damage like my level 18 Half Orc Barbarian...

Also, don't forget to through in the 11 skill points per level.