Which is better?

My friend is thinking about buying non-turbo eclipse, or talon and modding it to beat his sister's modded six cylinder stang. Her mods arent that extensive, short throw shifter, underdrive pulleys, and maybe an intake and exhaust. Possibly headers...... In any event, he wants to mod his eclipse or talon enough to beat her. The question is, which option would give him the most bang for his buck: doing an engine swap, although im not sure which engine to swap in, turbo-ing, or buying a bunch of bolt ons? He seems to want to stick with doing the bolt ons, but im telling him that for the money he spends and the performance gains he gets from them he might as well save his money and go for one of the other two options. Suggestions?

dude.....500 bucks go NOS......or the money he will spend beating her will be a good downpayment on an eclipse turbo.