King's X here Austin. You already have a decent driver unless you just bought it. You're obviously doing half way decent with the starter putter so you're in a position to make another choice.
All the advice on the putters is right on but if you're doing OK with the starter why not hold off a bit and splurge on a few Satin wedges? Then you get good at sticking the pins, making the putting easier, and your next bunch of credits could go for that putter. Just another idea.