I bought my XIM Edge with the famed Logitech K120 keyboard/G400 mouse combo, all together used on Ebay. I didn't like the bulkiness of the keyboard and wanted something more compact and chiclet-style (like a little laptop keyboard, and a mouse that was less bulky. To my surprise and joy, both of these work fantastically with my XIM Edge:
$13 A-Jazz Ray-Eagle 2400DPI mouse with woven USB cord, pretty LED lighting, 5 functional in-game buttons, plus two on-board DPI/sensitivity adjustment buttons:http://www.ebay.com/itm/221172806846?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
This mouse is surprisingly good for a China-made Razer clone. It's been my long-time desktop gamer mouse; used in Deus EX:HR, L4D2, Crysis series, etc. and always performed well. I love it, and its movement seems to feel just a little bit more agile than the trusty G400's bulky frame, but then again my G400 was used and broke after a little while, so maybe it was flawed, or maybe I just hadn't found the sweet-spot in its settings yet. In any case, I just ordered two more
of these mice about ten minutes ago (from above link), for my laptop and desktop
For the Keyboard, I went with a conveniently compact black chiclet-style 78-key off-brand thing that works just fabulously. It was $16.99 here:http://www.ebay.com/itm/78-Key-USB-Slim-Mini-Small-Keyboard-Compact-Desktop-Laptop-PC-Server-Black-NEW-/261180996904?_trksid=p2047675.m1850&_trkparms=aid%3D222002%26algo%3DSIC.FIT%26ao%3D1%26asc%3D11%26meid%3D6155112921128997599%26pid%3D100011%26prg%3D1005%26rk%3D1%26sd%3D261165660296%26
Keyboard has good comfortable spacing between keys (about the same as a regular keyboard, although if you're a big burly gamer with giant bear-paws and sausage fingers, or just just hate
laptop-esque keyboards, you might wanna go for a regular- or large-sized keyboard), and a nice clickety-click feel for the buttons. No LED back-lighting or anything fancy.
Hope this helps.