Jason,
Keep current for sure, though consider taking some of your rental budget, and offering to pay for some fuel, in return for some right seat exposure in other types, particularly those which you cannot rent. Don't plan to log that time, but it builds your experience none the less, just in a different way. I would advise against buying a type which you have not flown, that's a lot of cost for something which might not meet your expectations.
I helped build several amateur builts in my early days, and in each case, decided they were not for me. I turned down offers of sharing a plane, as my personal model was to fly my own with economy, rather than "ours" part time at a larger cost. 28 years after buying my 150, I'm still happy with it, and occasionally am able to borrow something bigger and faster. But, as said, choose the right plane for you, not just because someone else thinks it's the greatest!