USB Adapters work fine. I use one from I-Concepts that is the size of a large connector. Only complaint is that the COM port changes periodically if I play with my bluetooth COM ports or something.
I like the way Meridian does things. You can completly reset the machine and persist it's state in your computer. On Lexicon you have to write it down and play with the remote for a while. With Meridian I just re-download it. You have way more control over room correction. You can also send your configuration to Meridian or other owners to diagnose config problems. It's a way more powerful solution.
Lexicon used to make any tweak you made permanent, it drove me nuts and discouraged me from tweaking. With Meridian I tweak all the time because I know it's not gonna stick (unless I want it too). I know Lexicon way going to introduce multiple presets shortly after I moved over to Meridian to address this, not exacty sure what they came up with. But Meridian did it right a long time ago.
There is a zillion cheap laptops on eBay.
http://cgi.eBay.com/IBM-ThinkPad-R3...1715QQcategoryZ31554QQrdZ1QQcmdZViewItem