a mate of mine had a polo estate with the SDI in it and it wasn't THAT bad once you wound it up, another fella had a mk3 golf SDI, again probably about as quick as a 1.2 supermini but would actually go up hills.
If you can find one cheap go for it, for complete unburstable daily running you cant beat a mk3 golf tdi though. cheap as chips now as well.
For more modern, get the SDI, run it into the ground as a daily, and get a few quid back, might be worth looking at estates etc as they will be easier to sell and damn useful for picking up ebay buys, carting wheels bumpers around etc. (mk3 estates go on the bay for a grand and under all the time, had a mate who wanted one a while ago) Also caddy vans are dirt cheap these days as well.