This would be the next big purchase for the build and I'd rather Santa defray the costs.
I like the look of the sliders and the crank-outs equally as well, but it looks like the sliders would seal better from rain and dust. Is that true? Or do the crank-outs seal pretty well?

Crank-Outs above

Sliders above
Taken from Grants webiste:
http://www.lilbear.teardrops.net/parts4.html#windows
Also, can you install the sliders on their side? Like, could I install the above window with the long side vertically if I wanted to?