i think alot of clutch pedal feel has to do with proper adjustment and good parts..
a properly adjusted setup with a good quality cable and parts will be very easy.
ive never driving a mustang with a stock clutch too much.
my car had a KC clutch, smoked that on accident and bought the HD clutch (same as KC, but supposed to have a harder pedal)
my car always seemed like it had a stiffer feel with the clutches i have had.
when i replaced the KC clutch with the HD FRPP clutch, i also got a MM clutch cable and the pedal effort actually got easier, i was very suprised at how the clutch felt.
my DD at the time was a 5 speed s10 and its clutch felt stiffer than my mustangs clutch.
i used stock clutch cables and adjustables and etc but the MM cable is the BESY hands down, best quality and has done nothing but help.
recently i added a RAM powergrip HD clutch into my car. and people said the pedal would be stiff, i found the pedal didnt change much from the FMS clutch. might be a HAIR stiffer but honestly the difference in neglibable. but the clutch holds alot better.
so as far as pedal effort, i dont know why so many people have stiff pedals. i have never really had a stiff pedal. only time i did was when i first did my t5 swap and i had some stuff routed wrong and etc. it felt bad then.
i dont know i could just be used to stiff clutches lol
as for clutch reccomendations.
the FMS HD or KC (same holding power) works well.
i used them N/A and with my supercharger with my old combo.
with my old thumper heads, b-cam setup. running 115mph in the 1/4 i could leave the line at 5k+ with no problems. busted off a best of 1.64 60' then.
added TW heads and put in an F-cam, and upped the boost and starting tuning the car. the car is running ALOT harder and will slip and burn up the FMS clutches easily.
wasnt too bad starting out but starting getting the car running really good tune wise and with more boost. car would be at WOT in 4th gear and suddenly rev up like i just stabbed the clutch but i wasnt, just smoked the clutch.
replaced the FMS kit with the ram powergrip HD and havent felt any slip yet.
so my opinion, for a good street car that isnt going to be too radical i think a KC would be the best bet.