I would recommend Underwater Creations to you.
They are very quick to respond & correct problems.
I purchased a MD-15 from them and when I got the notice it was shipped I saw they had made a mistake in my addy. They didn't wait to see if it would reach me regardless of the minor error on my addy, they shipped a second pump at once.
They are also very quick to responed to e-mails seeking infor on any of the pumps they carry.
They treated me great, I'll buy from them again whenever I need another pump.