Better, lighter contact points

I’ve already swapped out the RS10s for RS80s and lighter tyres on my 2011 CAAD10 105. This saved about 700g. I’m now looking at the C3 bars, seat post and prologo kappa saddle as places to reduce the weight of my bike. I’m about 70kg and 6′ 4″, so looking at my bike as a place to reduce weight without spending a fortune.

It has pretty much this spec, but 105 brakes
http://www.cannondale.com/gbr/2013/bikes/road/elite-road/caad10/caad10-5-105-compact-crankset-28419

A bit of research and some weighing show me the following:
C3 Bar: approx 320g
I think can drop 70g easily enough with a new alloy bar at 250g ish for about £60. Tempted by alloy over carbon, cheaper and less prone to damage
C3 Stem: approx 132g – not worth swapping unless I want to change stem length
The T3 ergonova set does look nice though

Prologo Kappa saddle: actual 316g
I seems to be about £100 to get to 200g so £1/g, but my current saddle is a somewhat uncomfortable. A fizik is tempting me, particularly the trial ones from condor.

C3 Seat post: actual 249g
I should be able to save 50g, a 200g post is about £80 £1.60/g but a carbon post will be more comfortable. It’s on the longer rides when my bum gets a bit sore / numb, always on the left side.

Not really tempted by changing drive train at the minute, I’ll wear it out first and then upgrade, gains made on swapping brakes seem to be very small in terms of weight, though the 6800 brakes look appealing.

£240 for bars, post and saddle would save about 220g, so about £/g and a more comfortable setup. Any suggestions for other things I can swap? Many thanks