I don't like single pump solutions for in-tank flow. Sooner or later it will be inadequate, regardless of the numbers, because all the flow comes from one location. Get at least two of whatever you end up selecting.
I'd suggest a set of Tunze pumps, but they have so many good options that I'd need more criteria from you to make more than general suggestions.
Do you have a budget? Any expectations?
For now...I like these options a lot...
Low tech:
A set of
Turbelle® nanostream® 6045 pumps. ($78/ea) Four probably makes the most sense. $312, plus some bucks for two timers. Roughly, two pumps on each side (they can be placed creatively) on timers to make a tide effect....all the flow in one direction for a few hours, then all the flow in the other direction for a few hours. Corals love it!
High tech:
A set of
Turbelle® nanostream® 6095's ($233/ea) or the
Turbelle® nanostream® 6055 ($184/ea), which are all controllable. Two should do it, but you may want more pumps eventually, as corals grow in and make getting good flow more difficult.
On my 50 gallon (36x18x18") I use a pair of 6095's, plus a couple of 6045's and one 6020. This tank is packed pretty full of corals - just to give you an idea what to expect.
If it was me with your tank and I was on a budget, I think I'd go for the low tech option and
possibly expand with controllable pumps later, if you want. They are not a necessity. (In fact that's how I did it.

)
Other interesting pumps you might want to consider are the
Turbelle® nanostream® 6040 and the 6150, aka the
Turbelle® stream 3.