Best handheld pdf reader (Not those e readers)?

What's a good handheld device that can read 1000 page pdf files with ease and not much lag, i had an iphone 4 but it was way too slow, also i have 8gb of books,

reason i don't want an e reader is because they are so expensive for something that can only read books with a hard time, so please anything else

Expensive? A good e-book reader, say Kobo, will cost you less than 20% of what your iphone cost.

And stop using PDFs - they are a very inflexible format - go for ePubs. I find PDFs uncomfortable or unreadable on all my devices, whereas ePubs work everywhere (except on a st*pid Kindle, of course).