If your looking for some good performance upgrades while keeping reliability this is the first place I would look at:
http://nrhsperformance.com
I bought a 1250 kit for my sportster and they helped me out with al the extra parts to get the most out of the build, also bought a set of thunderstorm heads which they did a stage 2 head job on too. They matched the right pistons to the head work, gapped all the rings and interlude them in the new jugs. Did all the installation work myself with a couple calls to them and they have outstanding customer service. after all done and through break-in period my bike screams.
Let me know if you have any other questions about my build or that site. I'm not affiliated, just a very happy customer.
Jeremy