Easy all

So my 2wd is running a stage 1 been running that about a year now but want a bit more! Is it worth going to a stage 2 or should I go straight to a stage 3? I want to keep the standard turbo that's the reason I'm thinking stage 2.

Then I've got the problem of a descent 3 bar map sensor, I've heard bad things about the brands hatch ones so what's options? Second hand Marelli ones are like rocking horse s**t and are crazy money when they do come up.

Thanks chaps!