Im always sceptical about buying second-hand ex-trade kit (as a GST150BCE would probably be) because you don't really know how it's been used (or abused for that matter).
No I'm not keen on second hand power tools myself. People who look after their tools use them until they've had it, and others just generally treat tools like crap.
I've got the older version of the Bosch, and it's an excellent piece of kit, but a new one is way over the OPs £50 budget.
green Bosch has served me well and well within £50 i think. Make sure its the one with the quick release blade rather than the one where you stick an allen key down the hole!
I have found Bosch PST 700 on Amazon for £29.99 delivered + an 8 piece set of Bosch blades for £4.99. I think it is a good price for this set and should bee good enough for my small home DIYs.
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