Harry is totally correct, the unique options you have today are the Irex DR1000S and the Kindle DX.
Also, scanned magazines… I have a feeling we are talking about image PDF’s and that is even worst for small screen eBook readers… I will say almost impossible.
If you have a big commute why not consider a netbook? It’s small, your magazines will load fast and look great on them (on a controlled light situation …train per example?) - half page each time of course.
Also the price is very tempting and one gets a full good computer in the deal too.
Just give it a thought, well thought and one can get one with some 6 to 10 hour battery too.