I am spanish so I have seen some Euro players play a lot of games. In my opinion, Jorge Garbajosa could be a good NBA player, Juan Carlos Navarro is also very good, but I do not think he would success if plays NBA basketball. Luis Scola is a huge offensive player, probably the best low-post player in Europe, but some say his defensive skills are not good enough.
Other guys I enjoy watching are Theodoros Papaloukas, Marcus Brown, Anthony Parker, David Andersen, Nikola Vujcic, Roko-Leni Ukic, Thiago Splitter, Trajan Langdon, John Holden, and Willie Solomon.
Navarro is just too thin to be a decent NBA player, but if he bulked up, watch out (unfortunately, it might be a bit too late for him...)
Garbajosa is a very good and versatile player, and Scola, if he ever goes to the league, could be a mor than decent 4
navarro is too skinny, short and unathletic for NBA shooting guard, and he's simply not a point guard. scola is great offensive player that could probably be decent NBA power forward. i really like theo papaloukas as best pure point guard in europe (truly amazing leader and distributor), but he is way too slow for NBA. tiago splitter is great prospect and his game is really well suited for NBA. whenever he decides to enter draft he'll fare well
Now that Rigaudeau or Bodiroga have retired or are past 30, the obvious answer is Luis Scola (ARG). Not Karl Malone, but would certainly be better than Kenyon Martin, Zach randolph, Carlos Boozer and other overpaid false stars. A better Troy Murphy making his teammates look much better and with an insane dedication.