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perhaps a capacitive touchscreen monitor (like Dell ST2220T) coupled with capacitive stylus would work.
I'm not sure it'll register pressure sensitivity like Wacom does.
if you really need your handwritten annotation to be as close as possible to that of papers (i.e. having variable thickness) I believe Wacom tablet is the only way to go. Though a bit overkill for annotation works IMHO.
It will definitely work for your usage scenario. But given Wacom market is pro art consumer, the price generally does not justify general annotation works nor does the feature set is geared to it.
Within that price range (<$1000) IMO you'd better invest in Tablet PCs (the real ones, not some Ipad or *tabs).
You get portability as a bonus, that's unless you need a bigger screen. (most tablet pcs are 12-13", the Wacom cintiq display is 21.5")
Alternatively, I've heard people manually modding their display with a Wacom digitizer, I'm completely unfamiliar with that, though.