I think a lot depends on what you're going to use it for and how much value you place on $133. That can be a lot of money to some and very little to others. If your gaming, I assume the second choice would be better, but not being a much of a gamer myself, I will defer to the game authorities on that. I do know that if you plan on using certain peripherals like a USB TV tuner stick, the i5 machine would definitely be the better choice, especially if you plan on recording the output. I think it would also provide a bit more future-proofing.
I'd say it depends entirely on what you're going to use it for. If you're not doing anything but word processing and Internet browsing, you might as well go for the first one. If you want to play any games or do anything demanding (Photoshop or other media editing), go for the second one.
If you can afford to spend the $133, I would do it. Better to have too much than not enough, in my opinion. While technically possible, the processor is not something you are likely going to want to bother to upgrade in the future.