Its up to you mate, but from what I've learnt, I would just stick with what you have.
The stock to stage 1 jump is the biggest jump you will have. stage 2 doesnt really make as much of a difference. Stage 2+ is great!
BUT, after shelling out £3300 to get my engine fixed, the most I'll be going to is stage 2 from now on.
If you are planning to go to stage 2+, get your money back and switch to Revo. This was my graph at Revo stage 2+, no dsg software either, other line is superchips stage 3. Its your choice at the end of the day though. If I could turn back the clock, I would have just stayed with my superchips stage 1 and saved myself loads of hassle and money!!!!