guys, again, i am not currently in possession of 200 GH/s. i do hope to accumulate it over the short to mid term (am currently in research mode, not in purchasing mode), but i'm more interested in the academic comparison of solo vs pool, or p2p vs "normal" pool, at that hashrate, so i can plan accordingly.
If you don't already know how to get the best profits out of 200GH/s then you really should not be thinking of buying that kind of hashrate. There is a good chance that you will never make a profit even with an optimal setup and your first attempt will not be optimal. There are complexities you need to account for that you will only learn with experience.
Personally I'd setup my own pool taking care to eliminate as many SPOFs as possible. A highly distributed setup is good with at least a couple of connections to the internet. cgminer's failover is helpful or you could run bitcoind on every one of your nodes and gateway them though a few internet connected bitcoinds for something truly distributed. Don't forget to merged mine too.
'research mode'?, 'purchasing mode'? This is tie wearing MBA talk. Don't obfuscate your thoughts with such language.