What's the limit for cart upgrade/VPI Scout?

Been looking at archived threads, and don't see this particular question, so here goes- what's the limit of how good a cartridge you can put on the VPI Scout? Currently using a Lyra Dorian, which sounds great, but I can't help wondering what would happen if say, a Titan i or other high-end cart were to be used? Anyone tried it? Silly question, I know, but is one better off investing in more in the way of a table, or in a cartridge? Sorry, had to ask. Thanks, Dan