Need frame geometry help

specialized989
specialized989 Posts: 145
edited January 2012 in MTB workshop & tech
Howdy all. Have found the funds to upgrade frame, and have got my heart set on a pipedream sirius frame, but Im unsure of what size to go for, I currently ride this Frame (although it has been heavily upgraded)

http://www.specialized.com/ca/en/bc/SBC ... &gold_ses=

The one that I have is the 17" frame, but the pipedream only comes in 16.5" or 18". I am 5ft 8" and have an inside leg of 33", the riding that I do is mostly over my local trail centre (cannock chase) although I do occasionally venture further. So I would like to know what size in the pipedream frame would be best?

Also, this is the geometry for the pipedream:

http://www.pipedreamcycles.com/sirius_2010.html

What differences will there be if I do swap the frame? Im not bothered about weight and stuff, I just have no clue about frame geometry.
Am i strange in that i actually ENJOY going up hills? Yes, yes i am.


PS: Full - Sussers are for SOFTIES AND BIG GIRLS