The MXR Dist+ is VERY similar to the DOD 250 Overdrive that I use. I'd have a hunt around and see which you can get cheapest. I got my DOD recently for £23 but they've sold out now :(I use mine into a pretty clean amp though, so what HTH says above might be a consideration...
blatantly get an SD-1 for that kind of tone. Or if you prefer it a wee bit tighter, more midrange (and imo more processed sounding) go for a tubescreamer. Don't even consider anything else.