I have Pinnacle software for personal use, here is their website Pinnacle .
I have a previous version that has a PCI card with a break out box. There is quite a bit of cool options with blends of scenes and such included with the package with more available in option packages. The set-up I have was about $200 retail when I bought it over a year ago. There are numerous levels of software available from entry to profesional from them, I felt I got the most bang for the buck spending what I did at the time.
I've used pinacle as well. Ease of use was great. It did almost everything I wanted it to. If you're looking for something advanced, look into Adobe Premeir. It expensive and complicated as shit. Otherwise, there's other software for Apple computers (Final Cut Pro?).
If you're looking for quality video editing go mac or go home. Anything on PC is either garbage or is simply to much for windows to run properly. Final cut pro would be my first choice for entry level, but if you've got to go PC then Adobe Premiere (which you should be able to get on ebay for <$150) don't get the latest version though, get like premiere 7, which I think runs better on windows 2000 than xp.
I'd suggest a Mac, cause I've worked with them on video editting, BUT... i wouldn't suggest it cause i friggin hate apple and anything that has to do with it. If you already have a Mac, use Final Cut Pro. Thats actually a very professional software, lots used by the movie industry. It costs about $1000 though, and about $40 or so for a freakin filter and plugin.
Very similar but for PC, is Adobe Premiere. Works great too but PC does tend to suck compared to Mac. But once again, i say get Final cut if you already have a Mac. Not even worth buying a Mac just to use the software.
Adobe premiere is also about $999 bucks. but one word. kazaa it. or limewire.
If you want entry level, try Pinnacle Studio. It's amazing what you can do with it and how quickly it can be done. I also use Liquid Edition and I've spent time on Vegas. The more powerful editors can do stuff Studio can't, but they come with a steep learning curve. Even with the power of Edition, I still use Studio for a lot of my jobs.