18-15 is standard stock gearing, which is similar to mod, with 170mm cranks. I prefer 18-16 personally.
Average weight is around 11.5kgs I'd say.
Pro2s are so good. If you are one of the very very unlucky people that has a problem with one, just send it to hope and they'll sort it out for free as long as its within a year of you buying it, otherwise it costs a little bit, but hardly anything.
On another note, I also happen to have a surplus to my requirements Pro2 07 hub built onto a try-all rim, built by tarty with viz alloy nipples. All under 2 months old. If you want it PM me
Edit: Forgot the chain!! KMC. KHE will bug you to death.