I'm with Dave on this one. All the Vegas channels are blocked by a very tall mountain, so you'll notice that they are ranked from lowest channel number to highest because the lower the frequency, the more it is able to diffract. Only channel 2 looks like it's receivable on a regular basis. All the rest are extremely weak and will be very difficult to pull in.
The local translator stations (if they all go digital and remain on the air) might be your only realistic chance at getting a larger selection of channels. Unfortunately, the status and technical data for translator stations is not kept up to date quite as well as it has been for the major broadcasters, so it's not always clear who's really on the air and what programming they carry.
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I was wondering if it would be better to go with a Kitztech KT-200-Coax. If use the AP-8275 it would be about 35 ft down cable of the antenna and if I used the KT-200 I could place it 12 ft down cable of the antenna.
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The Kitztech amp is rated at 0.4 dB Noise Figure, which means you might gain as much as around 2.4 dB of net Noise Margin compared to using the AP-8275 (~2.8 dB NF). Yes, your signals should improve, but I don't know if it's enough to enable you to pull in more Vegas channels (the prognosis does not look that good, but you'll never know until you try).
The difference between 35 feet and 12 feet of RG6 is probably going to be pretty small (maybe around 0.5 dB at VHF frequencies). On one hand, you might say that every little bit counts, but on the other hand, this tiny change is not going to be a make-or-break difference on any channels. On channels you can marginally receive (occasional break-ups or drop-outs), you might see a tiny improvement in channel stability, but that's about it.