Ultimately, the 3000 will a big improvement over the 2000 for the reasons Anthony mentioned. At the present, it's still in its infancy software-wise, which keeps it from reaching its full potential. If cost is a factor, you might also consider a refurb TS1000 and docking station, which you could get for less than $150. The TSU3000 will be your best bet down the road however.
Take a look on Ebay, I just got a TSU-2000 a couple weeks ago for $130, and I love it. The additional features of memory, larger screen, more buttons, memory states, etc. sound like they would be very useful, but you can do almost anything with a 2000
The 3000 is (potentially) a better remote (jump back, maybe conditional variables one of these days, better screen etc) but there are still many problems with the software. If you are very competent at programming and are willing to put up with and resolve problems the 3000 may be a better bet. The advantage of the 2000 (and the 1000 also) is that they have been around for a while, the software has been through numerous revisions and there is a wealth of knowledge out there - on this forum and others, check out remotecentral.com. None of the Prontos are for the faint-hearted though, you can do amazing things with them but it is not simple!
I have had a 2000 for a couple of years and I do not know how I managed without it. For the rest of the family, who don't care what equipment we have but just want to "watch tv" or "play vcr", it is one of the best buys we ever made.
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