Looks like a pretty sold card, I've been taking a good look at the geforce 550 ti. I have to admit I'm a bit of an nvidia man too :P.
Me too, but have to say, on that end of the scale AMD usually takes the win. The 550ti is a bit of a dud, I've never recommended it to anyone!
Tbh its not a bad time to consider an AMD card, if you were to go a bit over budget you could have something like this:http://www.newegg.com/Product/Product.aspx?Item=N82E16814121623
All depends on the rest of your system though?.... You don't want to be CPU limited and a 7770 or equivilent may be all you need depending on games/resolution