Those pools, with the exception of Slush (to some extent), are vulnerable to pool hopping, which will ultimately result in lower payouts to you if you do not pool hop. I would recomment BitP.it (https://pool.bitp.it/) or maybe one of the PPLNS pools listed on the wiki's "Comparison of mining pools" page, or you could try one of the geometric scoring pools -- I think the only ones which use the geometric score calculation are Eclipse Mining Consortium and Continuum (the website of which seems to be down at the moment)

Pools with lower hash rates will pay out less often, but for larger amounts. Over time your reward will average out to be more or less the same, not accounting for a pool's luck which, of course, cannot be known in advance

For some info on the concept of pool hopping, if you're not familiar with it: http://bitcointalk.org/index.php?topic=9928.0;all