I'm currently doing the same as you with my farm of various gear 1/3rd on Bitparking, 1/3rd on Eligius, and 1/3rd on BTCGuild. I have some BE Blades that don't like the load balancing configuration and their overall hashrate drops if I try this with them. They are currently pointed at BTCGuild, although I move them around some.
It is hard for me to sit still though. A month ago or so I had 100% on Bitparking, but the variance was painful since I like to have coins to play with on a regular basis.
it's my block erupter cubes which are pointed at bitparking - hashrate is very stable. My line is thinking, considering difficulty, is that come next rise, it may be time to combine the whole rig and point it at a single pool. I'll be stuck to choose tho, don't suppose it makes much of a difference... as long as I won't mind the delay in payouts, i'll probably go with bitparking... but then again, it's a bit like scottish independence vote (i'm scottish), i'm like, '
pah, i'll decide which box to cross on the day of the vote' anyway, going off on a tangent now...
I've only got a total of 200GH just now, until Hashfast decide to send me my babyjet + upgrade, so what to do with 1TH come end of march? I reckon i'll be pointing it at a single pool. indecisive, as ever lol also, I realise i'm not going to be making any huge amount of money from my bitcoin mining (before anyone trolls in), it is just a hobby, while I am always looking for shops and online outlets to spend them. I noted a post today about a health food shop accepting BTC, so my next purchase, i'll probably buy some vitamins or something, just for the heck of it.