A few of the things you mention probably involve using layers or destructive editing, which LR4 cannot do, but LR is great for working with photos, in general. You might Google for Lightroom Elements Difference and see how each complements the other.
There is likely a new version of Elements, PSE11, coming out in a month or two, so if Elements looks like something you want to use, then wait a little while so the trial doesn’t expire before the release version comes out.
So, I’d suggest giving Paintshop Pro a trial run, first, and see if you can get it to do what you want it to do.
Then, perhaps try LR4 and PSE11 (or PSE10 if you can’t wait) and see how well they fit what you think you want to do.
