In ultrasonic cleaning you need to consider the size of the parts you are trying to clean / the size of the detailed bits on the part you are trying to clean. If you are trying to clean inside small crevices for example you need to be using higher frequencies. It isn't just about the power rating.
Here's some reading
Ultrasonic cleaning - Wikipedia, the free encyclopedia
 eBay.co.uk Guides - Buying an Ultrasonic Cleaner
I hope it helps with your choice. I can't give specific model advice as it has been some time since I used them in my work and I've forgotten what I used to use - sorry
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