There are not a huge number of pools as of yet.   It seems these ddos are happening each day.  
I've been doing well with a few failovers.  It seems random as to which pools go down, but usually nitro gets hit.
use this in the .bat to have the miner auto-switch if a pool fails.

-o stratum+tcp://ultra.leetpools.com:3333 -u weblogin.worker -p workerpassword -o stratum+tcp://utc.greekpool.eu:3337 -u weblogin.worker -p workerpassword -o stratum+tcp://utc.idcray.com:10001 -u weblogin.worker -p workerpassword -o stratum+tcp://ultra.coinsnipers.com:3339 -u Weblogin.Worker -p Workerpassword -o stratum+tcp://ultra.minepools.us:5301 -u Weblogin.Worker -p Workerpassword --failover-only

 If pools go back up, it will revert back to first pool in the list, so you can order how you like.  I've not lost much of any mining time with using 3 pools.
Hope this helps.