Beav cheap is never " best" but sometimes you can get " acceptable" for just a lil more. A 3x9 gets awfully weak on a 7mag. Especially if you are going to be shooting in conditions like the Sendero was made for. " On the cheap" I would recommend a 4x12x40 VX I in the Leupold. Its not a matte scope, but dont let looks override functionality on this one. You WILL want more glass than 9 on your 7 when the deer get small on the horizon. Nikon has a 4.5x14x40 in their Buckmaster line that is only a few dollars more than the Leupold. Either will be a great lil scope for your needs and gun!

Good luck and WHACK EM!
RA