I don't have any 99's at 122 combat, and I have never regretted rushing anything. My highest skill is 93 strength and it will probably be my first 99 in a few months. I never really saw the entertainment in rushing a 99. The cape would be a nice reward, but having the trimmed cape is even better, so the grinding seems to never end. I would suggest taking your time. Try to get all the quests done, get some items you wanted and some non-99 skill goals. Also, when I see a 99 cape for fletching, cooking, firemaking or something like that, I'm not impressed at all. I'm impressed by combat stats, and expensive skills like herblore and prayer.