Well, the cables are a known weak point on the Rega arms, but after all, this is only a $300 TT including arm, so it can't really be expected to have state of the art cables on it. The Incognito wiring kit for Rega arms is a popular one, as a replacement. The Heavyweight is definitely a winner on any Rega arm. The aftermarket VTA adjuster is mandatory in my opinion. The OL or Expressimo structural mod(end-stub) transforms the stock RB250 into a much better arm. The OL DC motor kit will end all AC line problems, and give smoother running. The acrylic platter upgrade can help with the resonances.
But you have to remember that doing all these things can cost alot of money. For the same money, you may be able to get another table that will do better than the Rega 2, even with all the upgrades. This should always be considered when doing major surgery on your table. Always ask yourself, "could I do better by selling the TT, and getting a higher level table, while still having the same amount invested?" That will keep you from overspending on mods, and keep you on the right track toward getting the most bang for your buck.