That's a really difficult question. I can really only think of De Bruyne (KRC Genk), but he has already signed for Chelsea. It obviously remains to be seen what he'll achieve, but he's definitely the most talented player of the league. By far, even.
There are a few others who I'd consider for a very, very low fee.
Players that I'd like to see in a better league, out of curiousity mostly because they're all huge question marks as far as I'm concerned. Suarez is one of them. Others I can think of are Canesin & Biglia (also Anderlecht), Chen (KV Mechelen), Cyriac & Vainqeur (Standard), Vossen & some young CM whose name I can't recall right now (KRC Genk).
There are probably a few others I'm overlooking now, but the overall the level of quality is poor. So unless you're talking about an immense talent (Lukaku & Courtois last year for example, Witsel & Defour to a lesser extent, and De Bruyne now) you really shouldn't spend much. As a general rule, I'd say anything over 5 or 6 million for someone from the Belgian league is insanity. While the prices I hear going around for Suarez are all around 15 million...