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I believe the regulation for the UK is 500FPS w/ 0.20g instead of 0.25g but I digress.
With the upgraded trigger sear, piston sear (you already have the piston sear as discussed above) and cylinder you should be OK for a while. I worry a bit about the spring guide stopper and to a lesser extent the spring guide itself but if either of these parts break it shouldn't affect any other parts. (Meaning you shouldn't loose anything important if they do go.)
The cylinder head (which I think you have an upgraded already) and cylinder are not strictly necessary upgrades. The Teflon cylinder suggested by Bean will make the bolt pull easier although you could just graphite lube the interior cylinder retaining rings to get a similar effect for much less money. The bolt handle is (from what I've heard) a good idea for the 170 spring although again, it's not as if anything major will be affected (except maybe your knuckles :-D ) if the bolt handle decides to go.
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