If this is the card you are getting:
http://www.evga.com/articles/00821/#3753
...that's one great little card. Way more powerful than it should be for not needing a 6pin aux power connection. I have that card on my 2nd machine (3.4GHZ Phenom II X4). It totally amazed me when I ran Crysis 3 at 1080p. I used to think the HD 7750 OC card was a fast no-6 pin card. The 750 Ti SC is in a totally different class. You'll be quite satisfied, and pleasantly shocked at the difference from your APU's on-die GPU if that was what you were using previously. And it should be a good balance with the A10 quad core.
If you ran the Catalyst Install Manager and had it uninstall everything including itself, you should be fine. If you want to be super-certain, run Driver Sweeper from safe mode (F8) and have it remove any remnants of AMD, ATI, and Nvidia GRAPHIC driver it can find. Then re-boot and install the latest driver for your card and OS.
http://www.techspot.com/downloads/4266-driver-sweeper.html
The issue with CCC leaving a border around the screen happens to me too sometimes. It seems like it happens when I use HDMI instead of DVI. But it is easily fixed in CCC. Nvidia drivers and Nvidia Control Panel has never had that issue for me.