Unless you absolutely need a 4 door, I'd get the ELR. I regret not foreseeing the huge price drops or else I would have bought one instead of my volt.
So if might behoove you to buy two of them, or look for a wrecked one for parts. But isn't the drivetrain essentially the same as the G1 volt other than some software tweaks to get a little more performance and a larger SOC?The ELR is a great car and I love mine, but keep in mind the only approx. 3000 were made and it will likely be near impossible to get certain parts in the not to distant future. This is less of an issue with the volt due to production numbers.