Hi Suil, welcome to PCHF!
koolj is correct in that you should start looking at upgrading the whole computer. Also is half correct with the DVI connectors. All LCD's come with VGA connections...and almost all of them have DVI connections which only the newer graphics cards have. They also come with adapters to turn VGA monitor plugs into DVI.
A P3 processor is now so old, that Intel don't even use that kind of
RAM anymore, and the video card slot that you have, AGP, is now phased out and only in very rare motherboards.
Whatever you buy now, will not be transferable to a newer computer.
Another bit of advice...250watt is what your
PSU was originally, but power supplies drop 5% of it's capacity every year due to aging. The 6200 video cards are rather power hungry, and need 2 12volt plugs to install them (they give you an adapter to convert). So first of all, you will need to upgrade the power supply, as 250watt was huge back in the day, but this day and age, standard watt is around 400-500watt.
If you do end up getting that video card, you won't see much - if any - improvement, as your computer is being held back by the
CPU.
I'm not suggesting that you don't get the upgrade, I'm just making you aware of all the scenarios, as I have personally gone through the same upgrade steps....getting what you can afford at the time
Hope this helps!