If you want the option of being able to swap around wheels on the nice bike, and still have power. Then you want crank/pedal based metering.
If you want a powermeter you can swap between nice and training bike. The powertap seems the better option.
You can get a CAAD10 for £1k new. That leaves £500 for a powertap hub, a stages, or almost a power2max. Assuming the bits replaced by the powermeter are sold (ie crankset if buying P2M).
Depends.
If you want the option of being able to swap around wheels on the nice bike, and still have power. Then you want crank/pedal based metering.
If you want a powermeter you can swap between nice and training bike. The powertap seems the better option.
You can get a CAAD10 for £1k new. That leaves £500 for a powertap hub, a stages, or almost a power2max. Assuming the bits replaced by the powermeter are sold (ie crankset if buying P2M).
http://www.drakescycles.co.uk/m1b100s6p4131/CANNONDALE_SuperSix_Tiagra_Compact_2013/RS_GB/17315
http://www.drakescycles.co.uk/m1b100s6p4145/CANNONDALE_CAAD10_5_105_Compact_2013/RS_GB/17405
http://www.rutlandcycling.com/155056/products/giant-tcr-composite-2-2013-road-bike---black-red.aspx?origin=pla?kwd=&gclid=CIiMwtCgm7sCFclQ3godY2YAAg
http://www.evanscycles.com/categories/training-energy/power-meters