if you don't mind having a 10-key you can get a realforce 103 for $235 from elite keyboards. The switches supposedly have a 30 million press lifecycle, significantly higher than most keyboards, so it should last many years.
I bought both an 87UB (the $400 one) and a 103UB, and kept the 103UB because I both prefer the feeling of it over the 87, and also discovered that I like having a 10-key again. Had pretty much abandoned them.
well, for one the space bars are at different angles. the space bar on the 87 is a bit sharper and digs into your thumbs unless you use the feet to tilt the keyboard, which i prefer not using. secondly, though both keyboards use topre switches, the 87 is made by leopold for topre whereas the 103 is made by topre in japan ... the build quality on the 103 seems better and the keycaps on the 103 seem a bit more rounded and smooth.
...all purely subjective, of course, but i just prefer the typing experience on the 103 to the 87.
I bought both an 87UB (the $400 one) and a 103UB, and kept the 103UB because I both prefer the feeling of it over the 87, and also discovered that I like having a 10-key again. Had pretty much abandoned them.