I am looking at upgrading a couple of things on my felt road bike. Currently I have FSA compact Carbon Pro Team Issue cranks (50/34), with the megaexo bottom bracket. My chainrings are in need of replacement as the teeth are wearing down unevenly and cause slippage on steep climbs. I replaced the cassette with a new Shimano Ultegra cassette on both my training and race wheels. So, the first thing I need to do is replace the two chainrings. Does anyone have a good source for replacement chainrings from FSA? I also have looked at the newer ceramic BB's from megaexo, but noticed the VCRC ceramic versions are offered. Is their a definitive difference between the two BB's? Also, would I need the 8200 model? I am using the Ultegra 6600 series for shifters/derailers, calipers and wanted to make sure I used something that was compatible. Does anyone have any ideas of what to upgrade next? I have upgraded to ROL Race SL wheels and combined them with a new set of Michelin ProRace 3 clincher tires, swapped out to a Specialized Toupe Team saddle, swapped the Shimano brake pads to Kool-stops. Thanks in advance.