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For the wheels, from what I can see the Halo are around £120 all in, so I guess that is your upper wheel budget? In which case you could build a set yourself for a similar price (Mavic A319 ~£50 or KinLin XC-279 ~£70, novatec hubs ~£50, Spokes ~£20 = ~£120-150). At that price the KinLin in 28h would be my choice, assuming you're under 100kg. Plus you save yourself paying for 8 spokes ;)
If you're on a budget my 2p would be to try and source the below parts for free or as little as possible (£2-5) 2nd hand from the forum or ebay. Then "upgrade" them over time (if you need to). They are parts that new will always be at least in the £5-20 bracket, so you can easily save yourself £50.
Stem: ???
Bars: Planet X
Seatpost: Planet X
Saddle: Planet XPersonally I'd go with wider rims and stretch your budget a little to get them, trimming on other areas. Spending a little more now will be cheaper than buying another set later on. Even if you went with H Plus Son archetype (~£50 p/rim) the wheel cost would only jump ~£50 and would give you a lighter wide wheelset.
The Alfine (FC-S500) crank comes in black and bang for your buck is probably the best deal you'll find.
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The parts you mention I'm getting free from my brother, all of which came off his PX Pro Carbon.
That's worth thinking about. Haven't even got the frame yet and not in any desperate rush so will consider building wheels - only thing is I've never built wheels and only ever got the shop to do it (another cost).
Re the Alfine - is it possible to remove that chainguard?
Contemplating components in anticipation of getting F+F hopefully quite shortly. Any comments/suggestions on the below?
Wheels: Halo Aerorage / Planet X AL30
BB: Miche Primato Track – length???
Stem: ???
Bars: Planet X
Seatpost: Planet X
Saddle: Planet X
Tyres: Schwalbe Marathon 32c
Brakes: Tektro Mini V
Levers: ???
Pedals: Something flat with Velcro straps
Drive: ??? x Shimano DX 18T