Definatley go with the ATI Procharger D1-SC with 3 core intercooler. It makes great power because you can run more boost since it is intercooled and the kit is 2nd to none as far as quality and performance.
A procharger with intercooler makes around the same power as a standard vortech kit, A vortech with aftercooler will maker more power. Novi will also make great power. If you do go with a procharger upgrade to 42 injectors and a pro-m univer(sp). The fit and finish of a procharger sucks compared to a vortech/paxton.