Especially since the XT does have a Tube Screamer emulator that can be used as a boost in front of all the models.
Honestly, if you're looking to put a live rig together, I'd pass on a distortion pedal for the time being and focus on getting an amp whose distortion sound you like. A good enough amp, and you won't NEED a distortion. I stopped using my Metal Zone when I bought my first Mesa (a Rocket-44, relatively affordable) and I only bought my first overdrive recently, a Bodenhamer Electronics Chaos-modded TS9, to do the Andy Sneap thing and juice the front end a little. And, half the time, I don't even bother to hook it up, the amp sounds way better for lead without it.
A good two-channel amp and a footswitch will give you way more mileage on a budget than a distortion pedal and an amp.