I wouldn't go with Saleen kits, not that they make bad kits, they actually make excellent suspension, but you will be paying for the Saleen name. I have heard nothing but positive things about Steeda.
But I'll throw in 2 others you might consider: Griggs Racing and Maximum Motorsports. They are the top 2 in Mustang suspensions, they both offer entry level-racing suspension kits, all the way up to Racing kits.
Where grigs and maximum might be better, they tend to be a little bit more expensive. I am personally investing in a Steeda G-Trac kit because as Stalker said, Steeda only gets rave reviews. Keep in mind that they (steeda) sell what they race.
This is your car though, so dont get anything you might second guess in the future
I've heard a lot of the maxium kit. I'll have to keep that in consideration.
I am just trying to make sure I find a good balance. I obviously want the permance handling these kits offer. I just want to make sure my car stays drivable. I've heard some put get there cars so tight that daily driving sucks.
My car is meanto be a street terror, not a race car. So I want it to be fun and comfortable to drive.
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Bruce A Leggett
2001 Black GT
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3.73 Gears
Cold Air Intake
Superchip
Thats why I would go with an entry-level kit. Maximum's kit has springs, shocks/sruts, c/c plates, and a chissis brace kit. It will make the car stiffer, but it shouldn't be so much that you don't want to drive it everyday.
Bombstarter, not to take a shot at Steeda, but Maximum and Griggs also sell what they run. Most of the parts found on Maximums race car can be found in their catalog.
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Jesse Berger 90 LX, Previous 4 cyl. (Decommissioned, 351W on the way)
H/C/I+Bolt Ons
Best ET: 12.54@106 mph 2001 V6 5 Speed Daily Driver Windstar Intake, Dual Exhuast, CAI, Headers
Best ET: 15.6@88 mph (stock trim)
Hey folks, is he going for curves or straight line? Big difference in packages.Don't tell me you can do both. You have to make BIG compromises either way you go. Can't have both. Awsome launches make for poor corners and the other way around. South side bars are a fair, and read fair, compromise. They launch extremely well and handle about like stock. You make the call.
I have Maxmium's rear panhard bar and track link kit. I bought this over 3 years ago and it has done more over all for the handling on my car than any other suspension mod so far. Before my car loved to swap ends at will and boil the rear tires like there's no tomorrow. Problem solved!!!! I have never had those problems since. It is really like night and day the way the car handles now It helped with hooking it up for drag racing and tearing up the twistie's.
For a conservative approach i would do the MM LCAs with stock uppers, no quad shocks, H&R or FMS "C" springs, Tokico Struts and shocks. Then put some subframes, CCPlates and upgrade the front A arm and steering rack bushings to urethane.
This is a streetable and not too expensive setup and can always go to the full MM panhard setup.
Suspension Advice. 
Hey folks, is he going for curves or straight line? Big difference in packages.Don't tell me you can do both. You have to make BIG compromises either way you go. Can't have both. Awsome launches make for poor corners and the other way around. South side bars are a fair, and read fair, compromise. They launch extremely well and handle about like stock. You make the call.
