I got all of my squeeze boxes on craigslist. I expect to see more of them now that logitech has discontinued them.
While the touch is nice, I think even the Squeezebox classic would do just fine. You really start to appreciate the system when you install and use an iPad app to control your squeezebox systems. I recently tried both the SqueezePad and iPeng (after holding out for a long time). While both are nice, I have a slight preference over SqueezePad. It really makes using the system enjoyable.
The point is, when you are able to control it from the ipad, whether the device itself have a color display or not becomes less relevant, so you could save yourself some money and get some of the older units as well (and IMHO the classic is more bug free than the touch...)
But if you don't have anything and are starting out fresh, I am hesitant to recommend the squeezebox now that Logitech has discontinued it, especially buying new. A lot of what it does can be found on other devices (I use Pandora and it's available on receivers directly now..)
You can try the system cheaply without an actual SB if you have some ipad/iphone/touch around:
1) the server is free, download it and install it
2) install iPeng with player capability on your iphone/ipod touch, and use it as a player. ($10?)
3) install SqueezePad on your iPad to control it [optional, $10].
If you already have iPad/iPhone, this is the cheapest way to try the system to see how you like it.
SqueezePad can also act as a player, but I assume it'll be easier to find a ipod touch/phone not being used fully and use it as a player rather than an ipad... And if you are using apple products as a player for squeezebox system, you might begin to wonder why not just use airplay..
I recently tried a Sonos Player 5. It's a decent system. Pricy, but sound quality is pretty damn good. But even my wife complained because it lacks a simple on/off button, and no display. On the plus side, they will likely be around seeing it's the only thing they do, unlike Logitech.