Do you guys it's a good idea for us to just buy bitcoins straight from coinbase? And hope it goes up? That would be a risky way, but we can't rely on anything, and that's a fast way if bitcoin suddenly goes up. What do you guys think? 
I would avoid Coinbase, as there have been various complaints from users about arbitrarily cancelled orders. There are various alternative exchanges from where you can buy coins. Personally, I use Bitstamp most of the time.
I've been using Coinbase since they first came on to the scene. Now I pretty much just use their Exchange to buy/sell. Most of the cancelled orders were because Coinbase wasn't authorized to transact business in the location the user was in. Here in the US, I've been very happy with their service with the exception of time it takes to transfer funds in/out.
