2001 Yamaha DT R 125 or 2004 Yamaha DT RE 125
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Hmmm it's a toughy!
I prefer the DTRE's, because that's my little pup, but I'm more feling the DTR for looks here.
Personally, I wouldn't bother with the DTR performance wise since I'm reliably told the 2001 era of DT's suck.
Unless you want to buy an aftermarket CDI, they are just severely limited.
What's your price range out of interest.
I would recommend, not jumping the gun, and just ensuring you end getting a nice one.
It all depends on what you're after.