Arm upgrades for Goldring GR 1.2 worth it?

I'm thinking of buying a more substantial stub/counterweight for the Goldring GR 1.2, the one that has a RB-250 lookalike. Two questions: a) Is it worth the trouble? b) Which one is most cost effective? I figure I can probably take the upgrades with me to a Rega table in the future. I keep hearing things about how the Goldring table and arm aren't so great but I see it as a sort of stepping stone in the upgrade path throughout the Rega tables. Here are the counterweights I've considered:

1. Clearaudio turboweight - Pricey, but has slung counterweight

2. Heavyweight - Yeah, good luck finding one...

3. Pete Riggle (of VTAF fame) CCM - This one is dirt cheap ($85), looks pretty good but I've heard absolutely nothing about it

4. Michell Technoweight - $$$ but it seems like the most well-received and most justifiable in taking to the next better Rega arm

and finally....

5. OL Structural Mod - also a bit pricey, but comes very well reviewed and simple to install/remove

Anyone with experience with any of these? I feel like the rest of my system is capable of resolving the difference between stock and modified but is the table a worthy candidate?