I agree with Fran's dumbell pullover suggestion.
I'd also look into getting some jumpstretch bands to similate your lat pulldowns and other cable machines. Here are the many things you can do with jumpsstretch bands, including pulldowns.
http://asp.elitefts.com/qa/default.asp?tid=101&__N=Band%20Exercises
For most exercises, a mini, a monster, and a light will cover you.
And if you ever get a pullup bar, they are a great way to work up to pullups. For these, you may or may not need to add an average band to your set. You likely won't ever use the strong band unless you are utilizing them for accommodating resistance on heavy squats, deads, or benches. You could tow a car with those things!