ok, so i'm thinking again about a part change and it's my rear shock on my IH Hollowpoint. right now there's a manitu qr on there i believe. that's what was on there when i bought it. so how do i go about picking a new shock. i just ride xc, nothing crazy. i'm at about 225lb now, hopefully getting down to 200 or lower. what do i need to measure, how to measure? should i stay with air or go to a coil? and recomendations are appreciated. i've noticed some measurement sizes on them, just dont know what they mean like 7.875 x 2. saw some of the clearance stuff on santa cruz's site and got me thinking about getting a new shock, hopefully and upgrade over what i have now.