some general points:
paying 7% towards 1/60th of final salary is, based on the limited information you've given - but taking your age into account - a good deal.
If I were you (clearly I'm not though!) I'd take the FS option. You should keep an eye out for how your 'final pensionable salary' is defined though - is it your actual pay, or is there a deduction?
I'm interested to know why your friends have recommended the money purchase over the final salary (aside from the obvious 'it's cheaper'!).
Final salary schemes mean you aren't as exposed to stock/bond market fluctuations as you are in money purchase schemes; where your investment will go up and down, and so will the final pension you get out the other end as it depends on bond yields at the date you retire.
You do need to check what the impact is on your second state pension if you join the FS scheme; because you 'contract out' of the second state pension, you'll lose out on that pension.
S2P (as commonly abbreviated) is not the easiest of things to work out, but you can find out more info here:
http://www.moneymade...racting_out.pdf
It might be worth - if you don't have one already - getting a state pension projection for your own information.
http://www.direct.go...ast/DG_10014008