is 17ls2 a good match?

I can't help you with your specific question but I have owned the c-j 17ls2. It's a very good preamp with a nice rich sound. It is not as detailed as good newer preamps. This was c-j's first step away from the golden sound they were known for and it is definitely a change from the past but each generation of c-j preamps since then have moved a little further in that direction.

It does have a fairly high output impedance so your amp will have to have a 47k or higher input impedance.

Hope this helps.

Korykats, Why don't you try a VTL preamp? Instead of trying to find a preamp that has a nice synergy with your VTL amps, go with a preamp that the designer of your amps feels is a good match. If you're not happy with a VTL pre, then start the trial and error, or buying and selling, process.