I use a 5600, not as good as the SL-C, but good enough! And besides, I'm getting an XDA-One for all my Windowsy needs. The rom available free on My-XDA.com will give me 2003 on it! That's Bluetooth etc via the SD slot, Or better, wifi. (I HATE BT!!!)
Easiest way? Get One of each!
Cheap WinPDA, and a Zaurus! Better, get an old cheap winPDA, and get it for pence!