JPG, dont' worry about using the F XT as a daily driver. I got used to it. You can, since with a teensy you can reprogram everything to satisfy your needs. In fact I gain satisfaction from typing on this antique. (Yes, typed on this antique.) The only problem I have, which you must be aware of and which applies to F XT and F AT, is the stiff space bar. It's worse on the F AT though. The problem is these keyboards were designed to be pressed by both thumbs, much like the typewriter spacebars in the past.
As for teensy, whether you make one or not depends on your soldering skills. Fohat has a great example of a teensy with pins and breadboard. Alternatively, you could just get the following:
1) Dupont conector.
http://www.ebay.com/itm/Hot-Sell-10PCS-10-root-Dupont-wire-20cm-cable-Line-color-1p-1p-pin-connector-/190923337454?pt=LH_DefaultDomain_0&hash=item2c73eaeeeeKindly note that some listings feature male and some female. This link is to a connector with both female ends, which will connect to a teensy with pins on one end and to the output pins on the other end.
2) teensy with pins, $19. Try asking around geekhack, because some people should have spare teensies that they no longer use and want to sell.
3) mini usb cable, as fohat said. You should have it in any case!
4) Multimeter
With this setup, setting up your F XT should be a cinch. Try experimenting with different layouts until you find one that is comfortable!
Don't overspend.
$30 + $20 shipping is just about right these days in the US. The last 2 I sold brought around $35 and I considered myself lucky to get it. Remember that you will have to spend $25 for a Teensy and a mini-USB cable.
That puts you almost up to the low end of what F ATs are selling for (in recent months that has been crazy numbers like $50-$200) and the AT is a vastly more desirable board. Also much easier to re-sell if you don't want to keep it.
Yea, I don't want to pay too much, but prices are sometimes crazy recently, so it's harder for my limited patience. By the way, would you recommend making an external converter or internal one with usb cable going out directly?