No, what's holding your current card back is your current card. It shouldn't drain enough power to require a higher PSU max rating. I think the 9200s don't even have fans on them (just heatsinks). That's an indication of their low power consumption levels if they don't even need a fan.
If you're going X1950, then the PSU you linked looks good at first glance. Seems to be a "good quality" manufacturer.