I very much appreciate everyone's help. It has been a very frustrating experience - and very disappointing when I discovered a good video card that was recommended by several others wouldn't fit.
All the fanless video cards I have considered are too tall. Length doesn't seem to be the problem at all - there's plenty of room toward the front of the case. A card 300mm long could fit easily. However, from the top of the mounting tang of the video card to the bottom of the second section of the bi-level case, there is barely 10mm to spare.
A number of people, not counting a few here, have suggested a better video card isn't necessary because what I do is 2D or inconsequential to the video card. I don't know any of them personally, but I suspect they don't do what I do and don't understand that a better quality graphics card helps make my work so much better and less time consuming.
My favorite graphics program is a video memory hog, for some reason. I'm not a software developer, so I don't know what's up with that, but I do know the program runs much faster with a better video card than with a cheap one. Believe me, I've tried. And the hard part is the program isn't anything more than a glorified file manager - well, okay, I do more than manage tens of thousands of graphics and photo files with it, but the major editing and creation is done in a different program, Adobe Fireworks. And that program doesn't necessarily appreciate budget graphics cards either.
The next best reason I can give you guys for wanting a better, but still affordable, card, is the guy who will inherit this machine when I'm gone is a gamer. I don't know how long I got left, but I have terminal lung disease and lung function of about 20%. The guy has helped make my life infinitely better since I got sick and I want to leave him a pretty hot machine when I'm gone. I HOPE the machine will be antiquated and a major slug by that time, but I can't count on that.
None of that was anyone's business, actually, but some people seem to think I need reasons for wanting a decent video card. If those 2 weren't good enough, well, tough sh...
So, back to the issue at hand. My headache producing research last night and today seems to be pointing toward a 256bit card with 1GB video RAM. I'm guessing that it won't make a lot of difference if it's GDDR3 or DDR3 (not sure I even know the difference).
Now the only reason I feel 256 bit is better for me is the issue of multitasking and the large number of programs and images open at once (I've been known to load twelve or fourteen 16MB images into Fireworks at once and have 8 different programs open at the same time).
As was mentioned above, the PSU fan is directly over the video card. This causes a couple of problems, I think. It can suck the heat generated by the card into the power supply and it may also deprive the video card fan of free flowing air supply if the card's fan is directly under the PSU fan. I'm thinking a video card that has a fan situated toward the back of the card might be better. The cool air from the front case fan will enter the video card fan, then be exhausted. The PSU fan will still inhale warm air, but it's not as bad as it would be for the video card.
Thanks for any guidance. I'm a little dizzy from all this. I didn't think it was gonna be this hard to choose a video card.
Grump