av8r :
I do a lot of video processing of home HD video and backing up and reencoding Blue ray collection to my hard drives. Also a lot of Raw still image photography in my business. I also hate slow computers and my system has delays sometimes even thought I just reinstalled W7. I am getting ready to buy an SSD to install and thought it might be a good time to build another system as my current HP built i5 750 is 2 years old. I can sell my old one to a friend to offset some of the costs, but of course I don't want to waste money if you guys with more experience think it is.
I suspect that there is some advantage in changing. It really depends on what you do, and what your current bottlenecks are.
If you have a cpu processing limitation, then consider a sandy bridge cpu.
They are some 20% more efficient per clock, and they can oc higher with a 2500K or 2600K cpu.
They also enable "quick sync" which uses the integrated graphics engine to greatly improve video edititn. I am no expert there, so do your research to see if it would apply to you.
If you have 64 bit enabled apps, then you can use ram to hold some part of workfiles and reduce i/o time. Photoshop is one such app.
Ram is cheap today, so 16gb might be very good.
If i/o is a problem, then No question a SSD will help. Everything you do will seem quicker.
A ssd is 50x faster in random i/o, and 2-3x faster in sequential i/o compared to a fast hard drive.
If your work will fit on a ssd, there is nothing faster.
Expect to pay $2 per gb. 60gb will hold the os and a bit, but 80gb to 120gb will be better so you can hold some apps and work space.
Today, Intel and Samsung seem to be the best for reliability. All ssd's will perform about the same as far as what you can tell. Only benchmarks show real differences, but benchmarks do not reflect what we actually do.