i use a TKL ibm space saver II (ibm p/n 37l0888, iirc). it's rubber dome, but so is the m4-1 (and with reduced travel, to boot), and the new lenovo/thinkpad travel keyboards are all chiclet, which i'm not too crazy about (although i have one of those too). the advantage of the newer trackpoint IV based boards is that the nub is much more responsive than the old-style trackpoint II on the M13, or the resistive type on the unicomp board.
another integrated device that i've found to be pretty reasonable is the multitouch + chicklets on the macbook pros, largely because of gestures.
in summary, you're not going to get mechanical + a good pointing device unless you build it yourself, so pick which aspect is most important to you. personally, when i'm working in an IDE, i go with the SSII. when i'm not forced to deal with some horrible mouse based GUI, i use my filco tkl with blues.