Hmmm...... actually, an SSD is very good for AE -- for caching. So get it for FCP, PP and AE.
I'll second Dave's answer, and add that an SSD is MORE important for AE than it is for the others.
Getting the fastest possible SSD will even give significant (noticeable) advantages over a slower SSD.
Having said that, if you get an iMac from Apple with the Samsung SSD, you can rest assured that's pretty fast. Not worth the effort to upgrade it with a third party version.
The HDD in iMacs are replaceable. And you can add a second one. And the RAM is upgradeable (by yourself) later.
There's some warranty implications for doing this that you should check out, but if you're tight on money it might be worth the compromises to order the base model configuration and add to it from after-market suppliers of SSD and RAM.
People that have built their own PCs know what I'm talking about, but some lifetime Mac users have little idea that the latest model iMacs are a little more upgradeable than prior versions.
But be careful, this isn't something to do if you're unfamiliar with the possible problems and warranty issues.
However for those of you thinking about it, yes, a base model iMac can be massively upgraded with 3rd party bits and pieces, and doing so can save you truly large amounts of money. Particularly if you're in Europe.
Just a real shame the video card can't be replaced for a 780ti or something equally meaningful.
Thank you for clarifying. That is why I asked I guess, almost made a big mistake.
This is really helpful. Thank you very much. Now to order my new baby, can't wait. I've been working on a 2008 MacBook Pro for years.