Trading a Z for STi bc of excessive elevation??

[RoshDawg]

So nothing is set in stone at all, and if it happens it would be in over a year, but I want to ask this question so I can know if I should keep putting money into my Z or not. Anyways, I am looking to have my work be relocated to Colorado where the elevation is pretty damn high (a mile up) (the 911 will be staying in CA). We all know that elevation robs hp in NA engines (about 55hp for the Z for my situation with all my bolt ons and before a tune), and that turbo'd engines pretty much don't care about the elevation.

So my '11 STi was sold to my younger brother (he still has it, but will be selling it in a year as he won't need a car in NY), and there is the option that I can just sell my Z, give him the appropriate amount of money and take back the STi.

I love driving the Z far, far more than the STi on Tarmac. Not to mention the interior, build quality (feel) and so on is better in the Z. But take away 55hp, and the inability to go on deep snow (which I loved doing in the STi) and they become pretty much equal. (Also the Z has a small handful of mods whereas the STi is stock).

I really am torn on this decision. I know I'm the only one who can make this choice but what are your guys' view on this? How much will a tune for elevation compensate the hp loss? Anyone live in CO that can chime in?

Thanks in advance for any helpful comments.