I would definitely agree that the other points are largely up to you and what you see fits your particular build the best (best being most fun, most effective, whichever you prefer). Some say put the points into Deadly Arts up to 25 for Exposed Weakness, others say put it into Trickery (though maybe not the best choice for a crit build, this line is generally more suited to a condition damage bleeder build) and some say stick up to 25 into Acr so you can pick up Fluid Strikes, since having less than 100% endurance is a normal thing on a thief, unless you are running SB or P/P at the time where you don't have to dodge quite as much. Shadow Arts (though not really my cup of tea ) isn't a bad line to look at either, especially if you have 15 points to spend because then your stealth skills last 1s longer, which on paper doesn't seem like that much of a difference, but when you actually use it, a lot of times it feels like you are in stealth forever with that extra 1s, which is nice.
As for gear, if you have trouble with survivability, a mix of Beserker's and Valkryie's is a pretty decent bet, especially since you don't lose out on your crit damage. Another way to do it if you are having issues with survivability is to do a mix of Beserker's and Knights, that way you don't lose out on quite as much prec compared to if you run with Valk's instead of Knights, but then you do lose out on the crit damage boost. Its all a trade-off. If you don't have any issues with survivability at all like some people *cough* Minion *cough* then full Beserker's is perfectly fine.
Till i get the GM book I'll be messing with my build on its on, after that ill do crit. So far I've been able to have 2-3 mobs that are 4-6levels higher than me. My traits atm are 10/2(idkwhythatsthere)/0/20/0 And Been surviving pretty good too! ;D