Um, care to elaborate a little? If you normally use it anyway, what's wrong with clamtk?
The underlying AV used by clamtk is clamAV. You can use a different front-end for it if you want, such as kde's klamav, but you'll still be doing the same scanning operations in the end.
Your other option is to get a different AV program. There aren't that many to choose from, however:
In fact, when scanning a questionable partition, it's often a good idea to run more than one AV on it. What one might miss, another may find.