Savage Mark II
In reply to the cheek weld on the plastic stock, yes, for me it was a bit low. The laminated stocks were better for this. Also, the trigger guard is a separate piece, not molded into the stock.
I have .22 calibre Mark IIs. The number of Gophers I shoot, the .17 cost would be excessive. When I want to play with a .17, I have a Marlin in .17HM2 that is quite accurate, and the ammo costs about half of the .17HMR. I find that Federal bulk 525 packs works as well as anything else in the BVSS.
A heavier barrel generally will give you a bit more accuracy than a light one. The mass of the barrel tends to dampen the vibrations that occur when you fire a bullet, giving less fluctuation in the cycle. Heavier barrels seem to allow more accurate shooting as it takes a bit more momentum to get them moving.
You have not said where you are, and what is the main intention for your Mark II rifle. This also has a bit of a bearing on options such as stocks and calibre. It also depends upon what level of accuracy you expect or need.
If it is for plinking or general use, the .22 is the way to go. I think I would opt for a heavier barrel, but the standard one would do. If I were going to use it for walking the fields, and stalking those Ontario Woodchucks, then I would probably go with the .17 HMR, again in the heavy barrel. The barrel weight difference between the two are not that much, but a bit of increased accuracy never hurts. In this hunting case, the cost factor of ammo is not so much a problem, because it might only be 10 rounds or so a day. However, out on the Prairies, where you can sit for half an hour or so, firing continuously, the .22 is better for cost. I have three magazines for my rifle when hunting Gophers, and many times I have emptied all three during a hot and fast session with targets everywhere.
You should go to a gun shop that handles the Savage Mark II, look at and feel all three models, then buy the one that fits you. As far as accuracy goes, my Mark II BVSS will shoot right up there with my Remington 513S Sporter, but my Kimber Government Model 82 will outshoot it slightly.