Hi fist thing i have to say is 'welcome' and sorry to hear about your bikes that must suck , and for the tyre pressure its up to you and what ever you find comfortable really i generally ride 30 - 40 psi , but for brakes ive heard alot of good news about the Avid BB7 mechainical disc brake and the power on 203mm is awsome , alot of trials specific shoes are great for trials riding but i dont see why people dont just get some skate shoes ' etnies , es' , DC they seem to work fine for me and you can ware them around casualy aswell.. oh and about that 'raped' thing change to single speed so if they do nick it they cant get far lol . connell ..........