You can't go wrong with either. I kinda like what you're thinking though... red centercaps on the LM's to match your seats. That would look great!
I have owned the LM's in the finish you're considering, they're great wheels, very strong, and classic. I also like prodrives, but not the style you're considering, I like the GC05 - they fit the nsx perfectly.
The two options you mention, silver 17/18 LM's or white 17/17 prodrive, are pretty different styles, and are geared towards different looks, not just a little different, but completely different (eg classy, high end, quality, compared to racy, track, 1 piece) - with a decision as large as wheels, I hope you're not looking at these two wheels simply becuase there is a set easily available, if this is the case, you will be unhappy with them in 6 months, and go through this hassle all over again.
Pick the wheel you're after, BBS LM's are a great option, I have owned several sets, for several different cars, over the years. The one caveat is the recommended BBS sizing, it is good on the front, but needs a slight rear spacer (approx 10mm) - I use H&R 15mm's on mine, which is slightly too aggressive, but works with aggressive ground effects.
