Rega RB250 Tonearm Upgrade Options/Opinions

Thank you everyone for the supplied information! I have been doing a lot of reading!

Anyone have any experience with the Moth OEM2000?

@butzchan, you don't mention a budget, but Jeff at Audiomods has a new model he recently announced. It is the same in most regards as his previous models (excellent arms), but incorporates his own carbon fiber wand in place of the Rega tube (the only part of his arms not of his own design and manufacture). All his arms are under a grand, and are great values. Details available on the Audiomods website.

@bdp24 , My budget limit is $1600. I am liking Audiomods more and more! 

Great @butzchan, you can afford even the new, best Audiomods arm. Jeff is a master machinist, making every single part of his arm. He uses silicon ball bearings (okay, Jeff doesn't make them ;-), his unique counterweight allows for variable amounts of moving mass (to suit the compliance of your cartridge), he installs stiffening braces inside his arm tubes (to reduce resonance), offers copper or silver internal wire, and, as @williwonka stated, terminates the wire with the excellent KLEI RCA plugs. You can get his arms with a single, uninterrupted (no solder joints) run of wire from cartridge tags to RCA plugs, the best way to do it.

The best - and cheapest - improvement is to rewire the Arm cabling (inside).