Stuck between a rock and a hard place...

[SRH916]

So I have always liked mustangs ever since my friend managed to score a '67, but now I have an opportunity to own my own. A '64 1/2 289 4bbl and a 4speed. (its in pieces, but all there without the engine and transmission. I can get them easy.) But I just bought my truck... Its so hard for me to decide... The truck I have only put about 1800 into including buying it, the Mustang would only set me back 1500. Unfortunately I can't have both (Not enough space...) Any suggestions? Decisions decisions.