Especially so if you're doing this with BSP..
For Level Design, you can probably fudge the 60.352 -> 64uu, and only be +3.65uu/meter.. which is very acceptable :] (or even just 60 would be good for most n-editor things)..
Since there may be some UEd/Editor newish types.. having distances that are, or are based on, powers of 2 is a very good thing, and you should always try to build to the highest grid setting possible. The previous sentance applies 100x fold if using BSP, as it will greatly reduce the likelyhood of you encountering problems with your BSP later!!!!
If you're building statics in Max/Maya/etc.. I think you can use the exact measurements without any problem. (Sas or someone correct me if i'm wrong here please..)