Personally, I'd keep the weight under a pound. Adding another 7 ounces like the other poster said, will affect balance. Keep in mind, that's almost 1/2 pound more weight up above. Your sweet svelte package turns a little more top heavy IMHO.. BTDT, just so you know... Not going to argue the point.
. I've had the swaro Z3 3-9x36 which is a damn nice scope, my buddy uses a Z3 3-10x42 on his lightweight 308 and he swears by it. Both of these swaro's weigh under 13 oz's and have excellent glass. The mention of the Leupold VX3 3.5-10x40 also gets my vote. One fine piece of glass and the weight is right around the 13 oz mark as well. The extra X'S help to see the critter/target better when stretching the legs on a cartridge, like the OP has. I've also had 4x's and 6x's and didn't really care for them, when shooting past 200 yards. Just not my cup o tea... Fotis, what is the max range you intend to shoot/hunt this rig? I will add this, heavy scopes do have their place: On HEAVY rifles...