Skip the rails and go low profile. Its a plinker so keep it simple.
These prices are though Optics Planet - just use their live chat to see whats available as far as discounted prices. Also, SEPT10 will get you 10% off and free shipping over $50 this month. Not sure if their under-MAP prices stack with a coupon, though.
DNZ Mount $50 retail, can be had for
$37 before discount. Maybe $33 out the door?
Leupold VX-1 2-7x28mm Rimfire Retails at $250, $225 with discount then
$175 after rebate. Or see what live chat will do with the OTD price.
Leupold VX-2 3-9x33mm $350 for the cheapest through $450 for the fanciest (custom turret voucher from Leupold to match your firearm and ballistics). Can't speak for the former, but the $450 is more like
$395 after you talk to them. Maybe you can get an extra $40 off that with the discount.
Also recommend checking out the
pic thread for some ideas on where mounts put the scope.