I have an aging GF2 MX card as well and after reading the article linked on the frontpage (to xbit), I went out and ordered a GF3 Ti200. I'd been planning on getting that videocard for my new rig soon and the news that nVidia has sold out of the Ti500 chips and is close to selling out of the Ti200 chips encouraged me to buy. I also looked at MX440 cards and after seeing the reviews I was pretty much sold on the Ti200. The added performance at stock speed, coupled with similar price ranges and the high overclockability of the Ti200 (up to Ti500 levels usually) outweighed any benefits that the MX440 had.
So if you're looking for advice, I'd say do what I did and get a Ti200 card (mine is an Abit Siluro Ti200 w/ TV Out, I got it for $138 from SR Systems)
sb