I'm sorry that I require more proof than just your "authoritative" word. It just looks stupid and foolish when you correct someone and you're wrong yourself, so I wanted to make sure that I wasn't being stupid and foolish, and asked for a source on your newly-presented fact. The name change to "W8P" is news to me, considering everyone apart from one person on your linked podcast, who also refers to WP7 devices as "Windows 7 phones", is still calling it Windows Phone 8, including Microsoft (link). I'll just keep calling it WP8 until I'm shown an official source (i.e. not TWiT.tv) by someone who doesn't mind resorting to primary school antics.
Back on topic though...
Why can't you use a micro-sim? You can just cut a regular sim to micro-sim size and then use an adapter when you want the larger size.
I personally wouldn't buy any WP7 devices right now as they have no upgrade path to WP8, which is just around the corner. I'd also rather go with the Galaxy Nexus over the Galaxy S3 for out-of-the-box, vanilla Android.
Well apparently none of the micro-sim plans are month to month. They are all 2 year commitment ones.