Sounds pretty light as it is, doubt there are many cost effective ways to drop any serious amount of weight.
I mean I am building some lightweight wheels (about 1300-1350gr the pair) but that might be a pound lower than yours and they will cost me near the 400£ mark. An expensive pound especially when you have pretty darn good wheels. (my current ones are over 2000gr and second hand so I am justifying it that way.)
I think the forks are more cost effective but that is something you are considering anyway. Probably you are dropping another pound off from that change no?
The other change would be the tyres? The maxxis are pretty heavy.
And no offense but if you are a bigger fella maybe try and lose a couple of pounds yourself? :p I can't go much lower am 8 1/2 stone