LOL 108 posts on switching from a t25 to a t28? Vadim, just do it... its not going to break the bank. If you are worried about price I'll likely have one of the ones I own for sale by the 8th when the egg is parted. I will sell it for 350, and if worst comes to worst you could sell your t25 to make up for it. just use your j-pipe and you are good.
My personal opinion would be to keep your t25 since its a daily. You like scooting around and being in boost. I know that's counterproductive of me selling my turbo, but I'm just being honest. If you are truly wanting more power, and are on a budget go GTIR. Done.