I also have a 29g
(18 inch tall) tank and am going with the new Finnex Ray II 30 inch as the LED
board is identical to the 24 inch with better spread and will give medium light to the tank. I didn't see if you had a specific budget but the 30 inch ray II is ~$95 but depending where you live and your electricity costs it may save you a lot of $$ in a yr or so. I'm ordering mine tomorrow so hopefully will have it by next weekend. The stock T8 15 watt bulb that came with my tank is worthless!
I'd consider the LEDS for increased efficiency compared with a 65w setup.