Can't knock the Leupold - excellent optics (at least on the new VXIII), great tracking, great reliability and durability, and great eye relief. I think that the new VXIII line has much better optics than the older Vari-X III (of which I own a few). But there are other options as well. Keep in mind, however, that as magnification goes up, the eye relief on the Leupold, as well as other manufacturers, goes down. As such, you may have 4.5" of eye relief at, say, 4x, but only 3.5" at, say, 10x.
I have an Elite 4200 4x-16x-50mm AO mounted on my 7 Ultra Mag. This scope has 3.5" of eye relief and it seems fine for even this big boomer. A 300 Ultra may need a bit more eye relief, though.
Take a look at the Zeiss Conquest 3x-9x-40mm. It has a full 4" of constant eye relief. And it's a great scope too. Optics are just as good, if not better, than the Elite 4200.
You may also want to take a look at the Nikon Monarch Gold. These scopes have a 30mm tube, but also have 4" of constant eye relief. Optics are top notch, and the performance is excellent.
As far as where to get a good deal, I have bought my last 2 or 3, or maybe even 4 scopes from theopticzone.com. Prices are among the lowest that I've seen them. They are one of our sponsors. Tell Jon that your a member of this site and I'm sure that he'll take care of you.
Zachary