This still comes down to touchscreen vs. buttons. Either will run nearly every HT setup out there. I don't think there's anything that any of us can say that would automatically be THE right choice for you.
My experiences in this decision were...
I ran a Sony 2100 (the 3000's older brother) for several months. I got tired of needing to hold it with both hands. I got tired of needing to look at it if I wanted to change more than the volume or the channel (this is what kills a Pronto for me too.) I didn't like having some lcd keys not quite labeled correct (IOW, the Sony's have a limited label set for the lcd keys. The 3000 does have 4 labels per device that are customizable but the others are still limited in what they can say.) In the end, for me, I wanted something alot more intuitive to use. (I must admit the Sony looked (and the new 3000 looks) really cool! IMO, the Sonys look better than anything out there until you get to a Crestron or a color Pronto.)
I went to an MX-500 and haven't looked back. (I did buy an MX-700 too, which is a hotrod version of the 500. But recently, I have went back to my 500.) It holds all of my commands. The buttons are labeled correctly so I know exactly what each function is. The buttons are sized and located so that many evenings, I can run it without ever looking at it. And now if a 500 user has some extra $$, you can buy a PC interface for it and program it from/back it up to a PC. (
http://www.irclone.com) All this in a easy to hold, one-handed size.
Based on your post it kinda sounds like you're looking at the Sony because of how it looks. One thing I would not do is to buy a remote just for looks. (Of course, looks won't hurt if the features are there too.) If you're considering the Sony mainly because of it's looks, you may be highly disappointed. If you buy it, buy it because it offers you a good day-to-day means of controling your HT.
The 500 has indeed been out for a couple of years. HTM has traditionally kept models in the line for several years. The SL-9000 is still being sold and it's been around for 5 years or so (although IMO, it's key "structure" is outdated.) So I think the old MX-500 still has a few good years left. (There is a 500 with rf capability (it is called the MX-600) coming out later this year but it's an addition to the line, not a replacement.)
I hope this helps some. But as I said above, my experiences may not translate to your's at all. Do as much research as you can and try to get a handle on the button vs. touchscreen thing. Then you'll be ready to buy THE right remote.