The best clam to start with is the derasa IMO. It is hardy and does not require as much light as the crocea or maxima. With the 2 175W MH, you should be able to keep it without a problem related to light.
I have a derasa, crocea, and two maximas in a 125 lit by 2 175MH and 196W PCs. They have been growing great for over a year.