Just to debunk one notion going around;
The 97 to 99 SSEi is about equal in weight to a 97 to 03 GTP 4 door
I've been on a scale with my car and a buddies 1999 GTP 4 door on the same day, same scale and they were within 20 Lbs of each other.
I used to have a 2000 GTP, 4 door Dark Bronzemist Mettalic. I had the car for 3 years and generally enjoyed it. On balance though I must say the interior was a huge dissappointment. The quality was poor and seats were crap including the simulated artificial leather they were covered with.
The 97 SSEi I have now is far more comfortable but the handling sdoesn't come anywhere what the GTP could do so that'* a bit of a trade off.
There is one other difference that may not be of interest to you. The SSEi hood vibrates like mad at speeds above 120 MPH, the GTP'* doesn't