you'll be fine with the base kit on stock internals. just take it easy don't do a ton of crazy driving.
i talk to several ppl with the fs kit...everything i hear is good.
fs will take care of you. i've bought a lot of stuff from randy and the guys over there. they'll answer all of your questions.
the mz3 turbo guys are running a lot more hp and tq than the focus turbo guys and they haven't thrown a rod yet...but for how long i dont know.
if it's in the budget, i'd definately get rods and pistons. the crank is just fine. juan is making 500whp in his 3 with stock crank