Help me pick the graphics card that best fits my needs

So I realize that some people build entire systems around a certain graphics card(s) they plan to use.
For me it was quite opposite. This is the first system I built and I did it a little bit at a time over about 3 months depending on what was on sale at the time. I saved the graphics card for last because it seems like the technology changes the fastest and I didn't want it to be obsolete by the time I got done building. So far I have:

600 watt psu
MSI P55-GD53
Intel i5 750
8 GB DDR3 1333 ram
2 x 32 GB SSD in RAID0 with Windows 7 Professional 64bit
2 x 1TB caviar green in RAID1 for data storage
Avermedia A188 dual HD tuner card
24 inch monitor
32 inch 1080p HDTV

Everything is running stock speed ie no overclocking



I've heard a lot of comments that say a graphics card depends on what you use it for.

I plan to use my computer for three major things:

1) Use my DVR tuner card to capture over the air HD digital tv signals and then replay them on my 32 inch HDTV.

2) Use my computer's DVD player to watch DVDs on my 32 inch HDTV.

3) I am a photographer. So I use a lot of Photoshop CS4 and Lightroom 2. (I don't do any 3-D stuff though, don't know if that matters)

And this may or may not matter, but...
I don't play games ... ever. Especially not fast shooter games. Maybe the ocassional Age of Empires 2 or something like that once or twice a year.

I would be willing to spend up to $200, but if something cheaper will do the same for what I need it for then I'll go that route.
I had been looking at the PNY Geforce 9500 GT 1GB. The GTS 250 is also another one I've been looking at, but I don't keep up with all the video card terminology (pixel pipes, processor cores, etc. ) to know what anything means or what is good.

Any suggestions or help?
Thanks