Actually it was a good answer.  I posted this first, and got no responses, so I posted at TRP since that is a bigger fund family and probably gets more traffic.

PRGSX is great. It's an aggressive growth fund with lots of emerging markets, versus the more value- and developed-market-oriented OAKGX. I own PRGSX and am thinking of buying into OAKGX as well - they seem to be complementary funds and you might want to own both.

I've owned PRGSX since Jan. '07.  Currently down about 7%, but I think OAKGX is off about 3% more than that.  Both good funds, but you're right...TRP has lower expenses.