My brother has just gotten into the hobby with a new 55gal tank with 20gal sump. We orginally decided he would only need a MAG 12, but J&L didn't have any so he ended up buying a MAG 18. He also purchased a CPR CS102 (dual 1" overflow rated at 1400GPH). He's just finally gotten it filled with water and is running the system. The MAG 18 is a perfect match, albeit throttled back a tiny bit with a ball valve inline on the return side. Plumbing is 1" PVC with a total length of 4' up & 5 - 90degree elbows. I'd say with a CS150, you'd have no problems whatsoever, especially after you factor in head pressure.
It's recommended that you have 200GPH less than your overflow is rated for coming back into your tank. A MAG 18 is rated at 1200GPH @ 5' head, so you'll have more than enough overflow ability with your CS150 capable of up to 1600GPH.
I always say, buy a little more pump than you think you'll need! In this case a MAG 18 would be a good match for you I think.
As for using 1 or 2 pumps? The only reason to run two pumps is redundancy. A larger single pump will be cheaper than two smaller ones, both in initial cost and in cost to operate. Also, I'm not sure that just by combining two smaller pumps on one return that you actually get the benefit of doubling the head pressure ability (but don't quote me on that).
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Cheers,
Andrew B.
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