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I've been running a shimano freewheel for a year now. Still works perfectly well. It's easy enough to strip,clean,grease and reassemble, which I tend to do every 3-4 months.
The dicta is really cheap, note there are no notches in it to fit the removal tool. You'll have to strip it and either use a vice, Stilson wrench or hacksaw to remove the inner part.
The white industries freewheel is the best on the market, a freewheel for life. Definitely worth the money once you've played around and found what gearing best suits your needs.
You should be able to build it up for a total of £500. but it always ends up costing more, in my experience :)
The OTP build looks solid, This comes with 48x16 (fixed) which is a little high for me, but if you get it then just go for a little spin and get a feel for it, then you can at least make a good educated decision on a new gear ratio. don't get the shimano freewheel its crap!