Only you can decide how much speed you need, but out of the two choices....
Radeon 9100 for $110
MX-440 for $70
That $40 difference will ~double the performance! Too bad you missed out on the Staples clearance of the Retail Hercules 8500LE cards... they went out for $100 and you could apply a $10 instant rebate coupon to that!
Only two weeks ago... maybe they still have one. 
In any case, I'd go for some kind of Radeon 8500/9100 (same card really) if you can get it for very close to the $100 Canadian mark.
Much better performance than the MX-440 and better quality/longevity to boot!
But either card wil kick the pants off your old TNT2!
:light::music::sun:
Radeon 9100 for $110
MX-440 for $70
That $40 difference will ~double the performance! Too bad you missed out on the Staples clearance of the Retail Hercules 8500LE cards... they went out for $100 and you could apply a $10 instant rebate coupon to that!
In any case, I'd go for some kind of Radeon 8500/9100 (same card really) if you can get it for very close to the $100 Canadian mark.
Much better performance than the MX-440 and better quality/longevity to boot!
But either card wil kick the pants off your old TNT2!