In a decently ventilated case, there is minimal difference in the OC capabilities of a good air cooler and a good all in one liquid cooler.
Usually, the air cooler will be cheaper, quieter, and more reliable.
how high you can OC your 3770K is dependent on the luck of the binning, but 4.5 +/- 0.1 is reasonable.
And... how important is 0.1 to your app or game anyway?
Worth is something only YOU can determine.
Personally, I think most will be very happy with a $30 tower type air cooler like the cm hyper212.
Spend the $ elsewhere.