What to do now as stocks are not so cheap

After new year, market goes up. I regret that I didn't buy in decisively in Dec, but I don't think it is a great mistake, just to teach me that market will always up and down, nobody can really predict.

Although Euro debt crisis is no sign to be resolved fundamentally and soon. But seems market chooses to ignore it first. I just don't believe European will change their lifestyle so quickly. Maybe the crisis will get worse someday.

But crisis or not is not so important at all, the lesson that I am waiting for crisis and miss this rebound is, market is always up and down, buy when cheap!

Now the problem is, as I already miss and now stocks not so cheap already, should I consider to sell or just wait to next buy in window? I think I will keep my income generating stocks and sell other stocks if price hit my pre-set ceiling.