Rumours is your best bet in Scarborough, it's the closest to a nightclub atmosphere. Fox and Fiddle (of all places) on Kennedy Rd near Progress often has a smoking hot Friday night.
Best bets are still downtown...Joker Fri and Sat is usually a sure thing...lotsa people 19-24...current music...good vibe
La Rouge, downtown, has a great Sat and Fri is often kewl and Fluid is still hot.
My advice on Legacy in Scarb is that it can get a rough crowd.
Mink and Lotus downtown are good looking clubs but they are usually full of the "stand and model" crowd of wannbe shooters.
System Soundbar, downtown, has a kewl, undergound late night vibe. The freaks come out at night!
Simply my opinion but it's also my job to know about and frequent clubs.
Peace.