[koji]

too many options confuse me. All I know is I want ebook reader. and what I ask for is:

a) readability, easy on eyes
b) just to read.(I don't need to be able to listen mp3 or watch movies)
c) support pdf (most of ebooks are available online in pdf right? or am i wrong?)
d) integrated englsih dictionary (I' still learning englsih, so this is a must for me)
e) basic useful features such as bookmark and highlights
f) no need of wifi
g) cheaper (it should be cheaper becase i am only asking for simple features)

anyone please give me some advice. is there anything else i need to have that is so useful? there are so many readers that all support different formats. how are these formats diffrent to one other? is pdf not enough?

thank you in advance
koji