Van Son is a great product- and probably one of the more widely used inks. I also hear fantastic things about Spinks Ink (Titan, etc.). It probably comes down to a matter of preference; I like Coke-Cola and my wife likes Pepsi for example.
If interested, I get "mill pricing" (large volume pricing) through Van Son and Spinks (for their inks and supplies)- I would be more than happy to let you pay what we pay- no commissions and no mark-ups.