Depending on the amount of bio-load I dont think it would be overkill but the 200 may be a better choice for him. The BK mini's are crap. Ask anyone that has them if they are worth the cash. I was on the list for one and cancelled after hearing what others had to say about them. The pumps are crap. The skimmate is hardly adjustable to get a drier foam and the skimmer is noisy.
I had a DAS and mine worked well and I actually like them. They are quiet and reliable but you MUST keep the neck clean for them to work well and consistently.
Food for thought... If you are looking at efficiency in your skimmer as the first thoughts in purchasing then you might as well just do water changes everyday. I have yet to find a skimmer that does it all so well that it would justify either the cost or the hassle.
BK is a "good skimmer" not great. If it was a perfect skimmer , then why is Klaus changing the design already? Deltec skimmers are "good skimmers" but I have yet to see one running that made "NOG" that wasn't a 1000 series or better.. (except in pics on the Deltec forum

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It's all about what you expect from the skimmer and it's usage. If you aren't going to push a skimmer to it's limits then get a NW skimmer with power efficient ratings and all that jazz. If you are creating a crazy DSB SPS and multiple fish biotope with a bio-load to match, go looking in the opposite direction.
Everyone is going to have thier own success story with this product and that product. Then go look at thier tanks and make an informed decision as to if thier philosophy matches your own.
Do they have 2 fish and 4 large rocks and 6 stag corals that look great and a BK 250 internal with great colors all around and a bare bottom with 8 streams and 2
vortechs just to swirl the missed detritus on a 125g tank which they fuss with all the time.
Or.. they have a **** load of corals and 20 fish all tangs in a 250g with a refuge and lps and sps and wavy things you cant identify and blah blah blah but running a Barr Aquatics SK5220 with a 100RLT in the garage but have fantastic colors and they are sitting around drinking beer and watching the game the whole time ??
Find out what you or he wants to do and a how to accomplish it then you get the equipment. If cost is a factor then buy a cat and not a reef tank.
Kasei