Get Dave's kit. I heard from a guy who has Sean's kit that it is more of a PITA to install than Dave's. He said he'd get Dave's if he had to do it over again. I have Dave's pulley and bracket and couldn't be happier.
All the billet power steering brackets are the same...except for the price. Roe is $10 cheaper.
On the Roe pulley I understand you use washers to space it. Roe's is steel and both it and the bracket are $140
Daves pulley is aluminum and both are $211
If I were to order today, I would get the bracket only from Roe and if I needed a pulley I would order the bracket/pulley kit from Dave.
BTW, I just installed Dave's brake kit on a gen2...front gen3 calipers and put gen2 calipers on the rear......I was VERY impressed with the quality and fit...VERY impressed..