Replying to Hmc40 vs. 70-200 f/4L

So I'm mostly a skater/skate filmer, but I have a couple buddies that are super good at skiing, and sometimes I snowboard with them to film. Well awhile ago we were filming and decided to get them more recognition, we should start a little production/media company and come out with a full length and a bunch of edits and stuff. Anyway, I've been working on the promo with the footage I have, but they ski a lot of pow and backcountry stuff, and I realized I need to get some nice tele shots from like across a valley or whatever. The problem is, I shoot on a 60d and the only lens I have at the moment is a tamron 17-50 2.8 VC. As you can expect, the focal length isn't gonna fly. So my dilemme here is do I save for like months and blow a grand or whatever on the 70-200 f/4L, or do I sell my skate camera setup (dvx100A/MK2) and buy an hmc40 for those distant zoom shots that I can also film skating with? My biggest issues are: -lowlight on hmc40 SUCKS ASS -I'm not a huge fan of filming skating HD -I'm in the middle of a full length skate movie as well that is primarily shot in SD, so how afwul willl it look if I mix in HD footage? Anyways, any advice is appreciated, although I'm leaning towards the hmc Thanks, Brennan