Please get FS2002. I am currently running FS98 too, and I can't wait to install my FS2002. However I'm out of hard drive space on my computer so I'm saving money to buy a third hard drive for my comp.
Here's what you can expect for FS2002, based on what I have read from customers on Flightsim.com, airliners.net, and other sources:
Lower FPS than FS98, but MUCH smoother. That is, 10fps will LOOK and FEEL like 25FPS. Because in FS98, have you noticed that in detailed scenery areas, teh frames "jump"? That is, instead of a smooth transition at lower frame rates, the aircraft and scenery jerk.
Well that's gone in FS2002, smooth as a baby's bottm.
Graphics are great, even if you only have the sliders on halfway. In FS2000, when I had it, I can to set the sliders back, and only the ground immediately beneath my aircraft had texture!! In FS2002 you can get away with more texture, and less drop in frame rates.
Autogen scenery: MEans less load on your computer. Autogen is a huge step up from the scenery in FS98 and FS2000, in that not every feature has been specifically placed, and created, rather, you have a set of standard objects that pop up in their respective places, all over the globe. What does this mean? It means the same building could be used in several cities at a time, instead oa specific building for a specific city, whcih uses up time and space to load, and makes the scenery complex. Autogen usues simple defaults, but don't think that "default" means crap, these defaults are unlike anything you've seen. Take a look for yourself.
Also, there's a new mesh terrain generator, more advanced than FS2000, and less taxing on frame rates.
Sound quality has improved, and the "landable water" is gone. That is, if you land an airline rin the water, it sinks, it doesn't just sit there like in FS2000 and 98.
Waves, yep, there's moving waves in the water. Fly over a lake at very low altitude, and your wake turbulence will stir up waves.
Lighting is back, rain is too, and the clouds are even more realistic than FS2000 clouds, perhaps the best yet. And also, as always, less taxing on frame rates.
So what does all this add up to?
Well, if you're getting 25FPS in FS98, you'll get 25FPS(smoother) in FS2002, plus alot, lot, LOT more.
Please go get FS2002, you will not regret it.