Before you decide not to buy one of the suites, try to see a demonstration of them. Version Cue (plus the fonts) make the suites a steal even if you have several apps (me too). Version Cue is only sold in the suites. I saw a demo at an InDesign Users Group meeting Monday evening.
Version Cue allows, for example, Photoshop images to include several 'versions' of a photo (different duos, or with different layer styles applied, etc), which you can decide between at any time. So if your client changes their mind, you just tell version cue to move another version to current in the Photoshop image and it updates InDesign automatically at the same time. That's just one thing it does, even for the single user.
So, even though I already bought Acrobat 6 Pro, I'm going for the suite. Between Version Cue, the fonts and GoLive, the suite is cheap. Not even counting the updates of Photoshop, Illustrator, and InDesign.