I know it's a bit too late, but if you can get a hold of one of these little gems, the Micro-Detailer, you will have about the only drilling tool you will ever need (for plastic, anyway)--perfect for nearly everything, and Michigan Toy Soldiers also sells the bits for it. It was originally produced and sold by the now-defunct WWIIModelmaker website, and is great for delicate work--the RPMs aren't sufficient to melt plastic, and it is so easy to handle. At $24, the price isn't bad, either. Perfect for stanchion drilling....if the Tamiya drill doesn't work out, you might think about it.
http://www.michtoy.com/MTSCnewSite/supplies_folder/cutting_drilling/md1001_micro.html
I'm sure it's available from other distributors--this one just had the best description.