well the first one is easy, for valve clearance checking all you'll need is a set of feeler gauges, just about any car place will have them, just be aware they come in metric or imperial.
the second is more a case of how much you're going to use it
something for just the odd chain change will be £40-50, have a look here http://www.bikehps.com/acatalog/Bike..._Tools_97.html
however if you're looking for something more and are going to be doing alot of them then look at the "Whale" brand, more expensive but it's what the pros use.
Cheers Mark.
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Life should not be a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, in a cloud of smoke, thoroughly used up, totally worn out, and loudly proclaiming, 'Wow! What a Ride!
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