Suspension upgrades are an easy and worthwhile upgrade. While enjoying it keep one eye on the classifieds for a TT. Once you get really bitten by the power bug the only thing that is worth the time and labor is having the TT. At that point decide if you want to be a mechanic for the project or the salesperson for the project. Most will find the sales route easier. Once a worthwhile TT pops up make the transition. Some folks simply cannot get away from their original chassis and want to do the swap. That is an option as well. It's really about how much time / money you have to dedicate to the process.