I would recommend you getting a Kindle DXG. I own one and have read manga on it. I found it really pleasant. The images look sharp and the text readable, zoom isn't needed. I can read for hours without tiring out my eyes. I use a program called "E-nki" to optimize the manga.
I know money is a problem. But you should look here in the Flea Market. Usually there are used Kindle DXG for lest than $200. And they are refurbished ones available for $245 at
http://www.amazon.com/gp/offer-listi...on=refurbished
Hurry up! I tell you: you are not going to get better reading experience. It's a total pleasure reading Manga on a 9.7 e-ink device. It's the heaven!.