How about running solo at the cheapest rig would be 4Ghash/s, at difficulty 1(or atleast thats what my miner says). would i make money quickly that way or is pools still my best shot at that point?
It takes money to make money. If you are only willing to invest 140USD, do not expect large returns, especially if you order this late in the game. By the time you get your unit, I expect the hashrate to be ~300TH/s. A 4.5GH/s unit will generate 0.054BTC/day under those conditions. This /day value will also decrease over time. Expect maybe 6BTC by end of year, currently valued at ~166USD.
This is my opinion on what you should expect as a moderately bad scenario but the value of BTC could be higher or lower and the hashrate could be as low as 200TH/s or maybe higher. My point is, don't look at bitcoin mining as a way to make quick money. Think of it more the same way you would investing directly in bitcoin: a longer-term investment.
Just my opinion.