Also, genuine question, since my turbo is pretty much done for, would a bigger turbo be an easy upgrade, or am i gonna have to replace injectors and so on?
As someone who's done it on the 1.4 122hp CAXA,
I'd advise against it. I've installed the turbocharger off of a CAVD (160hp), no cat downpipe, full 63mm exhaust, front mount intercooler kit, watercooled-intercooler block-off, r8 coils mod, ngk 1 step colder plugs and probably a few minor things I'm forgetting. The car was able to achieve 240hp on 100 octane and a little over 320nm torque.
It's fun for a while but you get bored of it fast. If you want fun, the 1.4 is not it. There's no replacement for displacement. You'll be spending upwards of 6k to make your car go faster than a stock GTI, who then can get a remap for $400 and beat you anyway. It's a small engine with a lack of low-down power.
Plus, you, on the BLG, should be able to just get a remap and get 200-210hp, so is it really worth investing all that money for 30 extra? Get a GTI, you wont regret it if you want fun, you will regret it if you want fuel economy..
TLDR: Fix your turbo rather than upgrade, not worth the investment.