I actually did the testing on this exact case for you man. I started releveling my thief when the pedi came out a while ago. My thief was level 58 and I took it to 65. I had the SH and the peti because I had the SH for my monk when I solo'd. Anyways, here is what I found out.
The torama obviously suck. No matter what your gear, it won't be fun. You can actually skip them altogether if you wish to be creative and hit up some other, less heard of places for EXP. Regardless, let's just skip out on the Torama for the purpose of this.
If you're looking at thief, /war is a great sub. You will get some serious grief for it, but there is a solution. Get a few friends with you that are good players, and make your own party. If you use a high damage dagger, e.g. darksteel kukri+1 or the like, and you eat sushi, you can honestly have 1 rajas ring and 1 victory ring, plus a PCC. Or, you can have 1 sniper, 1 victory/rajas, chiv chain and the pedi make for a mean ass SATA DE. If done right you can get over 1k+ to the raptors in valley of sorrows, which you are coming up to soon.
Overall, to cut this short, the pedi is a great piece for thief, especially for weaponskill. I know 5 attack doesn't sound like a lot but with berserk up and some sole sushi and a few other pieces of attack gear, you WILL hit the big numbers.
Test it out yourself, but if it is a matter of money, you can mix a whole slew of odds and ends gear to make one mean ass thief. Trust me, I did it and I loved it. Have some cool ass macros that swap in a bunch of possibly inexpensive, yet useful gear for your SATA DE macro and you will be shocked at the outcome.
It pays to think outside the box. Go with the pedi and see what you like the most.