I have a Palm Pixie (used to have a Centro) and I love it. I didn't get the Pre because I wanted the smaller size and I'm OK with the small screen. I'm on Sprint and I have the "Everything" plan (the $79 a month one) and that includes data. The Pixi from Sprint doesn't have WiFi capability.
My Pixi syncs automatically with my Outlook Calendar, Contacts, and Email (we use Outlook at work), and will also sync my Google Calendar, Gmail, and Yahoo Mail without any additional apps. It has a Tasks app that it comes with that apparently syncs the Outlook tasks, although I don't use Outlook tasks. I have not tried Google tasks or contacts. The Pixi also meshes together contact information from Outlook, Facebook (because I have the FB app), Google, and Yahoo (because I use those email accounts) so I can type in one name and see their contact info from different programs. It's rather interesting sometimes...but you can tell it not to link them up if you want. Most of the time I know the Outlook contact info is correct because I keep it updated and don't rely on Facebook contact info.
Once I had the Pixi set up and all the account info entered (and after I had backed up the Centro just in case!) it automatically synced everything up with the Pixi, although it took several minutes. It did this "over the air"...I don't have to plug it into my computer, but I do have that option.
For tasks, I use Toodledo.com (free account). I use the "Done" app on the Pixi to sync my tasks from Toodledo to the Pixi. It works well for me, but I don't really enter tasks on the Pixi...I tend to enter them at my computer, so I use the Done app to look at and check off tasks when I'm out and about. (Toodledo also has an app that syncs with the iTouch, which I have as well. I sync them all up).
I keep notes on my computer, and I take notes on paper instead of my phone so I can't comment on any note apps for the Pixi. I do have Docs to Go on my iTouch and it works fine, but I don't do any notetaking on the iTouch either...just reading.
I actually still have my red Centro in my drawer. It's got a couple of cosmetic scratches on the case, but it should still work (haven't charged it in forever). If you're dying to keep a Centro for the time being send me a message.