When it was time for my purchase of a new H/S i looked at the slk7 and at the slk-800 and i saw very little difference, fin count being the first. Based on the fact that without a fan one cost $40 and the other cost $20...I went with the skl-7. Matched with an 80mm vantec tornado temps were pretty darn good before i got to "modding".
Under load at 1.85v i was at around 43-44C
Then i lapped it temps dropped 6 degrees.
Then, i got to the fun part. And i dont know if htis can be a "plus" for the heatsink but...i've been running p95 for 20 min's at 1.95v and i'm at 28c
I ducted my A/C into the case...but the point is that i spent around $35 for my HSF and i have these temps...o yea baby