If you're looking for springs that mount in the stock positions (not coilovers), I would recommend H&R. They generally offer 4 levels of stiffness and lowering for each model of Mustang. Since they are progressive, they ride better than many specific rate sets, but they stiffen up nicely when you get into corners.
As far as how much to lower the car, it's not necessarily bad to lower it more than 1", but if you do you will need caster/camber plates and possibly a bumpsteer kit to maintain good geometry.
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2000GT Atlantic Blue: Cobra R Wheels-17x9 255/40/17, 17x10.5 315/35/17, tubular K-member & control arms, Tokico 5-ways, coil overs, sway bars, strut/shock tower bars, 70mm FMS throttle body, Saleen nose.
79 Pace Car: Maximum Motorsports suspension - H&R Race springs, Bilsteins, rear control arms, chassis bracing, Draglites, 302 w/ Edelbrock Performer intake, cam and 600cfm carb, BBK equal-lengths & H-pipe, 2.5" Flowmaster 2chmbr exhaust, Al Driveshaft, 8.8 trak-loc, TCI C4 w/ 2000 stall, B&M
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