Can You Help Me Please?

Wait for the autumn sale and get all of it more?

Check the trades
http://www.steamgifts.com/trades/search?want=The+Binding+of+Isaac
you should get several of them with your money

i too suggest to wait for a sale...but if you cant wait i would have go for the metro games - those 2 are great games especialy if you liked s.t.a.l.k.e.r (they are more linear thoo)

if you ask me, i prefer Metro (if you like FPS)
like sarevok says, try trades and you might find "cheaper" one

i would go for the metro bundle and save the rest of your money, so you can buy binding of isaac rebirth later at some point.

Thank you all =)