the FX 5200 and R9200 perform pretty much equally under DirectX8/9
FX 5200 Ultra and R9200 Pro however, the 5200 is around 20% faster in all aspects.
Also the R9200 will gain around 10-15% speed from the current Catalyst (4.5) however the FX 5200 will gain around 50-75% speed from the current Forceware (56.72)
(this is from the base drivers Cat 4.0 and Forceware 44.03 provided on disc)
Although 8months ago when i tested these cards were pretty much equal using the Standard versions; i'd say the optimised drivers really do allow the FX to show some real speed.
However the Standard cards are pathetic imo; if you want an FX go for the Ultra.
Speed Difference being;
Cube in DarkBASIC Professional
5200 - 360fps
5200 Ultra - 820fps
9200 - 310fps
9200 Pro - 540 fps
about 6months ago you could've said that ATi owned the top and mid range with the 9600 and 9800 cards; however the FX 5700 Ultra is quite obviously in-charge in the midrange... as it even outperforms the 9600XT (hell it even outperforms the FX 5900/5900XT), so really unless your going for top-end cards you should really be looking towards an FX.
5200 Ultra out performs the FX 5200 / 5400 / 5600 & the Radeon 9200(any) / 9500 / 9600 SE Cards (all of which quite comfortably).
Really the Standard FX are about as much use in getting as the SE or Standard Radeon's... quite frankly with FX unless it has the Ultra on it; don't get it, as for the Radeons unless you see Pro or XT don't get it.
The power is just not worth it for the cost!
Driver wise though; choose VERY carefully there.
Performance wise the FX will run the same on both Pentium & AMD; however the Radeon will loose around 15% of thier speed if they're not on an AMD AthlonXP / Athlon64. (the others it doesn't seem to matter much)
Driver wise, the Radeon's are unstable on AMD Duron, Intel Celeron processors ... it's beyond a joke how unstable they are.
Also Via hardware seems to reject any card which isn't a 'brand' name; So unless your card is ATI, Sapphire, PNY or Creative - splash out the extra for the name.
This goes without saying though, because the brand name cards perform alot higher than the 3rd party cards.
my FX5200 performs around the same as the MSI and Mentor 5200 Ultra, and it has half the ram... so be careful about spending a few extra dollars for something with a name.
The price of the 5200/5600 isn't likely to drop much at all; they'll just disappear from the market really.
5700/5950 are going to drop probably by about half; NVIDIA have 3 cards planned.
6200 - Entry Level (8pipelines 300MHz Clock)
6600 - Mid Range (10pipelines 380MHz Clock)
6800 - Top End (12pipelines 400MHz Clock)
6200 Ultra - Entry Level (10pipelines 350MHz Clock)
6600 Ultra - Mid Range (12pipelines 400MHz Clock)
6800 Ultra - Top End (16pipelines 450MHz Clock)
Not sure if the midrange will be called 6600 or 6400.
I know that they're working towards another set of cards to replace these in 6months; being faster but the same stuff included.
your entry level 6200 however will still be quite noticeably faster than current high-end cards.