E-revo power plant

So, I just received my pair of 2S Flightmax 5000 30C hard case lipo's from Hobby City (in an impressive 5 days - including the weekend, BTW) and was doing some reading last night. Rumour has it that the stock Titan 550 motors don't really like being pushed with Lipo's for long..

So the question is, what is the best bang for the buck in terms of an upgrade replacement? Brushless is clearly the way to go in terms of maintenance... Do I grab something used when the inevitable happens, or the Turnigy 2350Kv kit? How does it compare to a MMM/2200 combo or the Losi Xcelorin systems?

I don't need insanity or uncontrollable power.. Just fun, reliable performance for bashing and roaring around with my friends...

Look for some feedback / ideas gang...