Have you tried Cgminer or any other software, GUIminer is a nice way to get yourself into mining, but it's just that.
I wouldn't expect to handle or be a good choice for a multiple GPU setup.
I would love to try out other miners but my cmd skills are mediocre... Tried Phoenix 2 but can't get it to work properly even following closely to the instructions on readme.
Cgminer seems to be more complex because you will need to extract the file using the proprietary decompressor, which again runs command line and the instructions are not clear.
Could you point to me some clearer instructions on how to use the other miners?