Well, one point to consider is that you simply CANNOT upgrade to version 10. Sony won't sell it to you, no way, no how. You might find a 3rd party with a license available, but it will be an outright sale, not an upgrade.

Personally, i've got 9 & 10, and i've got the trial of 11 that i've played around with. I stick with 9 'cause it just plain works.

I'm using 10 and am happy with it. A couple of bugs but I've learned to live with 'em.

Upgrading to 11 is a gamble. As you've probably read in the forums, some people have no problems with it, while others are dealing with lots of crashes. I believe the crashes have been significantly diminished with the updates and the work-arounds that folks have figured out.

And IMHO, I think you should probably get some more RAM. 4GB is not a lot when you're working with large video files and special effects. I had 8GB and recently doubled it to 16GB, along with a :NVIDIA GeForce GTX-580 I've been able to get version 11 to work now without wanting to pull the rest of my hair out and smoke 3 packs of cigarettes.

I've been using the "Compatibility Mode" work around. Which is funny because recently I updated my 3D graphics program, Daz Studio 4.5 and it kept crashing on me too. But as soon as I ran it as administrator and in Compatibility Mode, no more crashes! So I guess that's another clue for y'all. ;-)

11 has been working well for me, but it was a fresh install on a quad core with 8gigs of Ram. I agree with the poster above that you need more power if you are going to jump to 11. I am already putting together an 8 core with 16 gigs of RAM.

I think 11 does add a fair amount, but does also up the ante on the need for power, especially if you are going 64bit. If you are living on an XP computer and not ready to make the jump to Win7 and a more powerful setup, you might think twice about that (no systems specs listed for you). You also need to be ready to deal with all the tweaks and changes you will have to deal with......

Since XP is more or less on the way out, I decided to make the whole jump at once. You may have a different outlook. There will be an eventual obsolescence involved, including with plugins and other kinds of updates, but I know folks that are still using 7, so........

11 is not an option on an XP machine.

I'm probably one of the few on this forum who will NOT be upgrading. I'm happy w/ version 10e and won't be upgrading my SLI video card until next year anyway. BTW, you'll need a CUDA V2 card to take advantage of the CUDA acceleration features offered in 11.

I'm not a pro and render times and realtime play back is not critical for what I'm doing right now,

The speed increase was really tempting but I would have had to invest in a new video card and dump my current ver 1 SLI which works great on the only game that I do play right now so I'll keep it until next year.

As Chinworks mentioned, you can't purchase VP10 so, imho, if VP9 is working for you now, I'd wait until Vegas Pro 12 and at which time you can get a better upgrade price.

I downloaded the demo Ver 11 a while back and noticed that they didn't address the .png image sequence bug. That fix may have pushed me over the edge to upgrade, but ended up using that $$ to purchase Neat Video noise reduction plug-in.

Re: RAM, depending on what type of projects you'll be working on 4Gigs is quite anemic. I have 16Gigs and regularly use up 12Gigs or more on some projects when rendering.
i648.photobucket.com/albums/uu208/bk-vegas/12gigRAM.jpg

I'm still using Vegas Pro 9 and was thinking of upgrading...

What specifically do you need that you don't have?
If it's just for a new Splash Screen then I'd say, "Don't upgrade."

All my primary edits are done in v9. I only use v11 for Closed Captions and final output for broadcast.

Adding too many "bells and whistles"...just to have more...can start to drowned out and interfere with the great editing tools below.

I downloaded the Studio 12 demo and noticed that the disappearing .png image sequence bug is STILL ALIVE AND WELL. One nice thing is they increased the video track count to 20!