Here's some sources of aftermarket parts for distance casting, and some Abu reels that aren't generally distributed in the US (but are popular in Europe and Australia). Both shops sell the Abu Pro Rocket and Mag Elite reels. Hatteras Outfitters also has some customized reels that are only available through them (e.g., custom colors or chrome plated 6500 with distance casting upgrades). These shops cater to competition casters and beach fishermen:

http://www.hatterasoutfitters.com/
Good selection of high performance reels and customized reels, as well as bearing, gear, brake blocks, and drag upgrade kits. Also sells special high performance reel oils.

http://lgf.sea-angler.org/index.html
This is an online tackle dealer in Australia. He sells the standard Abu reels but also carries some great stuff not distributed in the US. I've bought several reels from the guy and he's great to deal with. If you're interested in a high performance 5500 or 6500, and want something none of your buddies have, check out the Pro Rockets and Mag Elites. Notice the old style side plates and spool tension adjustment knob. Steve will also do upgrades on the reels for a small charge (e.g., high speed gears, stainless steel gears, special drag washers, special bearings).

Keep in mind that these shops are selling reels to guys that want maximum casting distance. Some of the reels (e.g., the CT versions) aren't suitable for drift or float fishing.

MikeT