[Closed] Surly Cross Check - Sizing and build advice

I'm getting closer to buying one of these I think. I'm not 100% on the size I need though. I'm 6'2" with a 35" inside leg, so I'm thinking a 58cm?

My current road frame is a 58cm, has a 25mm layback post and a 120mm stem. It has the following geometry:

http://dengfubikes.com/product.asp?id=2&classid=21

Compared to the cross check: http://surlybikes.com/bikes/cross_check

How does chainstay length affect the ride of a road bike? The surly stays are 15mm longer.

Also, as for build. I was considering using my SRAM Rival groupset off my current bike, but replacing the 50T ring with a 46T (11/28 cassette)

Can anyone recommend some decent cantilever brakes that would work with my Rival levers?

Also, wheels. Currently thinking about building up some Velocity Aerohead rims or IRD Cadence rims, would these work ok with CX tyres? Both are about 20mm wide.

Any other advice (apart from: dont do it/stick to riding bmx/stop mincing about etc.)