5 people=600+ pounds, so you have to factor that in as well if you are going to be using your car as a people hauler. Drag racing stuff is really light, but may not be up for daily city potholes.
If Memory serves, these struts from strange ((
Strange Engineering Catalog ))weigh less than 15 lb complete with brakes and springs. Just need to mount em, then get a lightweight rack a pinion unit...etc....
I've seen altered style drag cars come in below 800 pounds as a rolling chassis, and they are a 125-inch wheelbase or longer. Just depends on how much money you have an how important weight is to you.
I'd say a weight between 1500-2500 is realistic depending on how hard you're trying and how much aluminum, magnesium, and carbon fiber you can afford.