Yes, it's better to go for a blu-ray player even for DVDs.
Simple reasons for that:
1) A blu-ray player will give the same, if not better, picture quality than a DVD player. All blu-ray players can upscale DVDs to your TV resolution. Some of the older DVD players cannot (although your TV can upscale them).
2) The price of blu-ray discs are coming down rapidly. So, in the near future, you will find yourself buying more blu-ray discs because the picture & audio quality is so much better.