I‌f you think $UNITED OVERSEAS BANK LIMITED(U11.SI)$  ‌is too expensive to buy, you are probably right.

Price met supply zone at $31-31.40 level with RSI coming off sharply now. I don't trade basis RSI, but it gives me an idea of whether the stock has buying strength or not. Generally below 50 = not much strength. Also, when price rises too fast, it is usually not sustainable. Of all 3 banks, UOB is the most volatile one that doesn't "respect" trend lines. 

I know most people who buy bank stocks are investors and will hold it for the long term. So they don't really time the market because they use "Dollar Cost Averaging", but who wants to AVERAGE UP their average cost? 

Therefore it is better to hold your gun and wait for price to come to "Possible Retracement Zone" or "Area of Demand". If you feel UOB is too volatile for you, you can consider ‌$DBS GROUP HOLDINGS LTD(D05.SI)$  ‌ or ‌$OVERSEA-CHINESE BANKING CORP(O39.SI)$  ‌ which are more stable. 

Good Luck.