thankyou for the compliment crash! i think my legs have a long way to go though - they lack size
i just squat. its the best exercise for legs IMO. i really dont do any other leg exercises except for occasionally doing calf raises.
i do low reps too - nothing over 5reps for working sets. im not too convinced that high reps work as well for combining mass and definition. as regards weights, i rep at 80-115kg for 3-6reps. im not very strong yet, but im hoping it will improve with my form.
when i first started squatting (just before christmas) i put an inch on my thighs in the first 4weeks. i did have almost constant ache there though!
i really am rambling here, but i dont think that you need to include anything else for thighs than squats (i just dont really like front squats, though they are an excellent exercise). i have heard that leg extentions can cause knee injuries if over used (due to your quads working at full intensity without any load on the knee) and leg press, whilst good for power, remove the issue of balance, so squatting is still better!
i have a love/hate relation with squats - when they go well i love em, but when i cant nail the form i hate them!