Teco so far is most efficient and death silent chiller I ever had.
It's not so cheap but I can recommend it...
You can buy used for decent money and it will work for you years.
Trade wind chillers are a great way to go in my opinion. Never had experience with teco although I've heard good things about them. I have a tradewind that I loved when I had m tank up and going.
If the two tanks that you mentioned above are tied together then I will say that you will need a 1/3 HP chiller to cool down that amount of water volume without overtaxing the chiller but be ready for the heat these units exhaust.