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I have to disagree with the most replying here so far. If it was my site and plan, I would first make a backup of the database of the original site and all files. Then I would setup a new wp install in a sub folder and see how that works.. It gives some flixiblity for plugins and stuff like that.
Then I would backup the database and all files for the second install. Export the blogs through admin tools - and keep that so you could import to multisite if you decided to go that route.
Multi-site is great, but the community is still hashing out some problems with the changeover, especially when it comes to wpmu plugins ans stuff. Also if you have php 4 - when you do the upgrade to php 5 to run WP 3.2 - it may break your multisite - so get make sure php 5 is running on your box before you go for multisite.
Mutlistie might be built in, but it takes some vhost changes and other annoying things to get it up and going, not a big deal for some servers - but not so easy with shared hosting. I've had more problems with upgrading multisite / wpmu over the years - supposedly this is all hashed out now that wp and wpmu have merged, and once you get over the php / sql 5 issue - but I do not think it is always that best option for everyone.
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