Curly,
The Accumark is a much heavier rifle than the Kimber 8400, as such, recoil will be a reduced accordingly. However, only you can make the determination as to whether weight is a primary issue for you.
As for the Win Mag vs. WSM debate, the recoil is about the same with the WSM having a bit less recoil all else considered.
In my opinion, despite Weatherby's higher MSRP, the Kimber is a better quality rifle. However, an accurmark for $1,000 is a steal. Plus, it's available right now for you.
Also keep in mind that WM ammo is much more widely available than WSM ammo.
Given all of your concerns, I think that I would go with the Accumark - if you don't mind the extra weight.
Zachary