Plasmas do pretty well in bright rooms. They aren't like rear projection televisions or projectors which do terrible or abysmal in rooms with light. The issue with plasmas is more often the reflections from windows. Still, in our family room with a 2005 home we have an entire wall of windows opening to a kitchen with a wall of windows and our Samsung plasma does just fine during the daytime for viewing. I avoid the 'reflection' seat or close the shades when I'm stuck in that seat during the daytime, but a closed curtain is all it takes to make viewing just fine. Just the window which is in line to create the reflection is the one that bugs me, and unless you get an anti-glare LCD screen, which is becoming more and more rare, then you may run into the same issue with a LCD display.
For the money, you are far better off with plasma for sure.
Otherwise, I would save up a bit for a better Samsung model if you could.