My 2550k throttled with the stock cooler during pre testing with Intel Burn Test at 4.8ghz
I only purchased the 2550k to test out a motherboard I got back from rma. I had a 2700k in my rig at the time. Got the 2550k from microcenter during the $149 facebook deal. Wound up selling the 2700k and the motherboard on craigslist as I have no use for hyper-threading.
I went water back in the Q9550 days as I got tired of being limited by temps. A couple little upgrades here and there but most is from the original loop. The biggest upgrade was the GPU I guess. Once I figured out it would do 1000/1300 I wound up finding a used full water block in the forum for a decent deal at the time. The stock fan was way too loud! I don't mind the constant sound of the fans as it's nice to have what you hear on bootup is what you get no matter what your doing. Pretty much sounds like a stock HAF 932 all the time.
I'm currently debating on downsizing my rig. Thinking maybe mini-itx but not sure if I want to give up water. Ivy Bridge runs too hot and most mini-itx cases don't have alot of room for cooling solutions. If I'm gonna rebuild I'd rather go with the latest and greatest but this round temps aren't the greatest. Might have to go micro-atx so I can keep water. Guess I'll have to look at cases and see what the options are. A small mini-itx rig would be nice and easy to lug around tho.