And fighter loose all its usefulness past level 4(weapon specialization).
Do rogues get Sneak Attack and better/more skills? Absolutely. But the fighter hardly loses all its usefulness past level 4...and you're definitely making a trade-off to take more rogue levels than fighter (and vice versa).
Yes, fighter is more AB, but with hips your ab is high enough. Yes, fighter has d10 hp, but with hips you are quite defended even then. Yes, fighter has bonus feat, but you don't need that many feats actually. What you loose as a fighter is a sneak dice. Pretty much main reason why you may want to go with shadowdancer here - to have reliable way to deliever three sneak attacks per round. Additionally with rogue 15 you can take crippling strike, improve evasion and defensive roll pre-epic. That means that upon reaching epic you pretty much just need to get 30 tumble to qualify for epic dodge - one of the damn best defensive feat in game. So yeah, fighter more the 4 is useless here.
Thank you. What would you suggest for starting stats, feats and level progression? Weapons? I was thinking of rapier and short sword.
Thats pretty easy - start as rogue. Preferably halfling. They are insane race xD Get 18-20 dex, do not ignore str and you cant sneak on) have decent int and con? get SD requirements asap as it would make you really awesome. Fighter you can push somewhere in the middle(not actually very imporatnt where exactly but be sure to get it pre-epic) . I advice shortsword, but if you are not halfling - rapier or scimitar. Up dex to 25 to get epic dodge and finish with around 30 dex. Get weapon finess asap and dont miss blind fight and improved critical. You better off with two similar weapons since this way you will have only one weapon to get WF, WS and IC for
as for skills - its simple: tumble, spellcraft, use magic device, hide, move silently and discipline - 100% take and max. Other - as you like. In companion search, disable device and open locks are useful since you can take capable figher as a companion that way. Or you can get diplomasy\bluff\etc. Kinda a lot of freedom with this one