I have no experience of the other cases you're looking at, so cannot compare them, but I went from an Antec 900 to an RV03 a few months back and I can honestly say I haven't regretted it for a second.
My CPU and GPU temperatures are very slightly lower than in the Antec (both with fans on their lowest settings) but not much difference if I'm honest. Noise is about the same too (again, with both on low and with both on high). However, cable management is AMAZING compared to the 900 and it is very, very easy to end up with a build where you can see virtually no cabling through the window at all. Also, it's very easy to stealth the optical drive(s) so the front of the case looks as good as without any - check the Raven's FAQ on Silverstone's site for details. Main thing is I just liked the fact it's different to anything else out there. Putting the hard drives behind the motherboard is an obvious idea once you've tried it, and again makes the front a lot neater, and having the case designed to take advantage of the fact heat rises is again obvious and you wonder why more cases don't use it.
The main reason I changed from the Antec to the Silverstone was because I fancied a change (had the 900 since late 2007) and I wanted something that was easier to work in. By the time I'd stuck two 5870's and three HDDs into the Antec, it was a pain to get to anything - mainly due to cables getting in the way of each other. With the Silverstone, it's so easy to get to anything and alter it, it's really lovely to work on. Some people moan about having to take a few screws out to change HDDs on the Silverstone, but they're coming from cases with tool-free designs where I was coming from the Antec where I had to undo screws on under both sidepanels to change one - I don't find the Raven a hardship at all on that score.
Like I said, I haven't regretted it for a minute and I absolutely love my Raven. I haven't tried any of the others, but again I haven't seen anyone with one on these forums say anything bad about them, so whichever you choose I think you'll be pleased with the results.
