Gavmar:
I have an Odyssey No1 black putter I am at master level
and could do with a new putter, which one should I buy with 2300 credits.
If you have your heart set on a new putter, the TaylorMade Spider X Putter (L77+) is on sale (today only) for 1996 credits, and it's a very nice putter.
You might also consider finding a more active country club. The owner of the one you are in now has not played in nearly 5 years and everyone in the CC is a Recruit. It actually looks like you are the only one in that CC that is still playing WGT. If you like, you are welcome to join mine (Mostly Harmless). We're small, but friendly. If interested, just go to our CC page and click Ask To Join.
Whatever you decide, best of luck to you!