Re: 5x5 vs 5/4/3/2/1
its typically 3 exercises so you pick one for the target area i.e flat bench for bench, close grip bench press for tricep. i remember there was a slightly modified version but look for hte thread started by Frankie NY on here it answers alot of questions.
over time i modified it slightly so that i would do for instance, flat bench, close grip bench, squats, leg press and then tricep pull downs. at the moment ive changed it somewhat more so i do.
d1 - deadlift, barbell curl, dumbbell hammer curl
d2 - floor bench press, floor close grip bench press, tricep dumbbell kickback
d3 - overhead push n press, bent over row, barbell returns
d4 - clean and front squat.
im combining this with 3/4 cardio sessions (normally after sessions d1,d2,d3) none on d4, then one cardio on its own normally sunday.