If you can afford it, buy the most expensive TM putter for 7.50, best
purchase I ever made and best putter available, also does NOT need upgrading. (edit - you already own it, good choice :) )
Then buy the WGT Tour Pro driver, 245 yards for 300 credits, those
two things alone should get you to Master and 10 bucks, pretty
economical. (will need upgrading but only 3 bucks)
Got a couple more bucks, buy the WGT Tour Pro 3W for a 1.20 and a
good wedge helps wonders around the green, PING Tour W Pro 60° and
TaylorMade Z-Satin TP Pro 52°for 2 bucks each, wedges DON'T need upgrading so safe to purchase now.
This is more or less exactly what I did. Once you hit Master, you
need the good irons (G10) and longer drivers but the above will get you there
and not break the bank.
Some cheap balls to slow the meter a little too, WGT GI-D for 50
cents work good, more expensive ones work even better and with the new wedges, you will need them.
Good luck and happy hitting.