Even if your card will softmod you will not end up with a 9800. The reason being is because you will never get the clock and memory speeds up to 9800 specs. But you will end up with a nice card.
I bought a Saphire Radeon 9500 from newegg a few months back it it softmodded great. By applying the softmod the card will go from a 9500 to a 9700 non-pro right off the bat. Then from there you can overclock the card to get it to 9700 Pro specs (325/310). Lastly, the most recent hacks have came about that enables some of the advanced features of the 9800 such as updated smoothvision 2.1 (although I haven't noticed any difference).
In the end I ended up with basically a detuned 9800. My GPU is currently at 350 and my memory is at 305 rock solid. The benchmarks I posted below were at a little faster speeds, but they were creating alittle too much heat so I clocked it down a bit. At the time I paid $155 and I ended up with a hell of a deal. I paired it with a 2500 Barton that I'm running at 3200 Specs. It's a damn fast machine, especially when compared to the Athlon 1.0 Ghz/Geforce2 MX PC I had before
Epox 8RDA+
Athlon 2500+ OC to 3200++ (2260=180x12.5)
512 MB Kingston HyperX
Radeon 9500np Modded and OC'd to Radeon 9800 373/308
3DMark 2003 (5477) Compare
http://service.futuremark.com/compare?2k3=800333
3DMark 2001 (16334) Compare
http://service.futuremark.com/compare?2k1=6524206