My 2 penneth:
Do not spend money on a bolt kit until you've done that, and possibly changed the cassette. Besides which going all titanium on bolts is silly when in fact there are some low stress areas of a bike that could take lighter aluminium bolts instead of titanium (e.g. bottle cage bolts, shifter mount bolts, brake lever mount bolts.
I bet your cranks alone weigh about 1 kilo or over !
seatpost-> http://www.chainreactioncycles.com/Mode ... elID=11375
pedals-> http://www.chainreactioncycles.com/Mode ... elID=52884
or http://www.chainreactioncycles.com/Mode ... elID=17264
saddle-> http://www.chainreactioncycles.com/Mode ... elID=58327
For cranks I'd keep an eye out for something second hand in the for sale section or hold out a spend a little more on something modern but light (e.g. deore 9 speed octalink cranks and bottom bracket).
If you don't need quick release wheels then replace your skewers with these: http://www.chainreactioncycles.com/Mode ... elID=26621
Same goes for seat clamp e.g. http://www.chainreactioncycles.com/Mode ... delID=6255
If you are feeling really cheap/poor I have an sdg saddle with a small chunk missing that I can send you for postage cost. A seat cover would hide the damage, or a leather patch could be glued on with shoe-goo or marathon/bison (from sports shops).
Good call on those pedals, very light at any price! Reckon we can do better on a second hand post though, 290g is still pretty hefty
Uno's come up fairly regularly and should be a bit less...
http://www.ebay.co.uk/itm/Kalloy-Uno-Se ... _500wt_949
http://www.ebay.co.uk/itm/New-Uno-MTB-R ... _691wt_932
I've seen Middleburn RS7s on here and occasionally ebay go for £40; that's a whole bunch of weight saved - getting on for a pound probably - and they are bloody lovely to boot
Still say look at the wheels/tubes/tyres before anything else though