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What ever you get for your PC, Adobe charged me $5.00 for a platform change when I went from PC to Mac.

Reference what to get, if you are only into Photography I would take a strong look at Adobe Lightroom. I use my Photoshop CS4 very little now.

i think this christmas or after christamas new year

Lightroom is designed purely for photographers...  Images edited in LR are not actually changed.  The edit information is merely stored as LR readable data within the LR Catalogue.  This means that any editable function (control) is able to be adjusted or removed completely without; 1.  affecting the image beyond that control (the original image is completely untouched except for metadata adjustments) and 2. affecting any other control's setting.  It is like having the layers function for everything you do without the hassle of managing each layer individually.

Having said that, there are still some functions that I need PS for (LR has limited abilities in the cloning etc as well as not being designed to conduct major changes to the image) but now I use LR I use it for about 95% of all edits.

I've no used ACR (I went straight into LR1.0) but from what I have seen the editing side of things is basicly the same as LR (all non-destructive and I even think the adjustment sliders are the same).  Yes, I believe the Adjustment Brush, graduated filters, Vibrance and Clarity were "borrowed" from LR.  LR doesn't use the XMP sidecars (unless you specify it should) as it keeps the data in it's own database (which can be packaged up with all the pictures and transferred to different machines).  I think LR will also read the XMP sidecar files created by ACR (or any other app that uses them) but I can't be sure as I don't do this.

The main distinction between them is that LR combines a library (image management system) into the app.  There is also; a slideshow, web and print module for those specific needs.  I kind of see ACR and Bridge as being two small portions of what LR does but then LR has the extra modules as well.

When I first got LR1.0 I loved it even though it only filled about 75% of my needs before I had to go to an external editor (like PS).  With LR2.0 came adjustment brushes and graduated filters which increases my LR workflow to 95%.  I can't wait for LR3 as it is sure to be taking me to, and possibly beyond (if there's stuff I didn't even know I wanted), the 100%.