If your work is heavy. I.e you want to play heavy games or using heavy programs for working purpose. Then there is no other option other than a laptop. But if you are mostly going to email and net surf a little than I would recommend you to get kindle fire, here are some specs of kindle fire:
-- 7″ IPS display. Full-color.
-- Dual Core Processor.
-- 14.6 ounces in weight. Easy to Hold.
-- Everything is backed up to the Cloud. That’s a bit much – guess with WiFi the costs for Amazon are much lower.
-- WhisperSync works with movies and TV Shows.
-- Heavily-customized interface – nothing like Android. Which isn’t necessarily a bad thing. Of course, if you love openness then you won’t like it. The interface looks quite good.
-- Gorilla Glass and 169 dpi for the screen.
-- Supports Multi-tasking. In particular, Mr. Bezos demonstrates background music.
-- This is a big one. Using the power of EC2 (Amazon Web Services related) to accelerate web browsing. Amazon Silk. It renders content in the cloud – dynamic split browsing which lets you do things locally or in the cloud.
-- All in all this feature might end up being far more useful than any of the others. It’ll make browsing on Kindle Fire very smooth and quite a bit faster.
-- You can do stuff like, watching movies, playing games, tv shows, read over 1 million books, Tons of apps (Word and Pdf editors included), internet surfing on youtube, facebook, twitter etc, emailing and stuff, music etc.
From my bookmarks here is a good review which would help you on this decision:
http://budurl.com/CompareTablets