
GF4TI4200 is still a fine card and for speed matches the Rad9600PRO and GF-FX5600ultra (even new flipchip one) unless you get into medium to high AA+AF or DX9. You can think of the following for how the Radeons fit into things:
9200 = Just like the 9000pro and 9100 it's still slower than the old Rad8500, still 'only' DX8 and inferior to the GF-FX5200 too.
9600 = Perf of a Rad8500/GF3TI500 but faster if you like AA+AF or want DX9. Roughly the same sort of speed as a Rad9500 or GF-FX5600.
9600PRO = Perf equal to a GF4TI4200 but faster with AA+AF (esp on high) and of course you get DX9. A step below the 'old' Rad9500PRO but only 15% slower so not hugely slower.
9800 = Perf equal to a 9700PRO but with enhancements like even better AA+AF and T-buffer. Quite a lot faster than 9600PRO and easily faster than a GF4TI4600/4800. Better than a GF-FX5900 and a lot cheaper too.
9800PRO = Perf slightly above the 9800 and generally just below the GF-FX5900ultra but then the price is much lower too.

Soon (with my predictions) ...
9800SE 128bitDDR = 9500PRO speed but again with enhancements inc even better AA+AF and the T-buffer. Half the pipes of the 9700/9800 (4) but 0.13mu enables much higher clocks. You should get 4600/4800 type speeds and easily pull away when AA+AF or DX9 come into play.
9800SE 256bitDDR = 9700 speed but yet again with enhancements inc even better AA+AF and the T-buffer. Again half the pipes of 9700/9800 but again 0.13mu helps that out. Easily far superior to any GF4TI and should challenge the GF-FX5900.
9900(PRO?) = 9800PRO built on the 0.13mu or pehaps still 0.15mu but with faster clocks than the 9800PRO. If 0.13mu it should easily be faster than any current card offering the full 8 pipes with 0.13mu clock speeds. If it ends up being 0.15mu it could feasibly have 16 pipes (double) which should really boost perf. Should be priced close to the GF-FX5900ultra and easily better!