OK when I get my new frame all the good stuff will go on it, but I should have enough bits around to make up the old frame as a singlespeed minus the drive train. That way I can have a bike for commuting and shopping that can be treated as crap.

I was thinking of getting a deore crankest and just sticking a single chainring on it, whats a decency singlespeed chainring most seem to have ramps and pins ect, and a dmr conversion for the rear wheel (sprocket and tensioner).

What have other people done? I want to keep the costs down so no middleburn uno cranks at the moment.

I found the on-one version of this worked best as a tensioner.... here

the other type skipped all over the place. It  supposed to be used pushing up on the chain but the cowled drop outs on the soul prevented this so I had it pulling down from inside the chain. I also had to run the chain line down the side of the roller as is would want to wander and pull the chain of the gear. I used the on-one gear and spacer kit on a standard freehub, but fine tuned the chain line with spacers off a knackered cassette. After a while I had to swap the gear out for the wider Surly offering as the narrow on-one was cutting up the hope pro II aluminium freehub.