Using django pagination or slicing

Hello,
Please I need an advice on the best approach to take on the following issues.
I have a database table consist of about 1000 record. I need to be displaying like 20 records at a time on a page such that when the user scroll the browser another batches will be append to the browser.
Below are the 3 ways am aiming to achieve this:

1. Using django pagination feature.

2. Everytime records need to be appended to the browser , an ajax call is made to the view, then the queryset is slice using appropriate lower and upper band. Then the returned record is appended to the browser.

3. Fetch the whole records from the database and transfer everything to the browser, then JavaScript is now use to slice and be appending as needed.

NOTE: The webpage would work like yahoo.com mobile site.
Please with approach is the best in term of performance and speed.

Thanks.

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