Advice needed for new DVD Player

[pocahontas2020]

Hi
I have bought quite a few dvd's recently and am thinking of upgrading (read "selling") my Sony GX300 DVD player for a new player. I have a Fujitsu 63" panel and a Lumagen VisionHDP connected to my DVD player. What player would you recommend? And from your experience, is there a major change in picture quality on shifting to a medium/ high end player?
Thanks

 

[pocahontas2020]

Forgot to mention, would be great to have a multi region player (since my current player is multi region 2 and I have a lot of region 1 DVD's)