"Most of the cartridges I have looked at are 0.3 or less so I need to find a Phono with at least 60db output. "
The 10x5 is a high output cartridge. But if you are going to use a low output card, I wouldn't use a tube phono pre unless you can afford a really good one.
If you want something that's foolproof and sounds really good, get a Dynavector P-75 phono preamp, and a Dunavector 20x2 low output cart. I have the same setup on one of my VPI TT's.