I'm sure that you'll enjoy it
So, the next decisions are... Which size? WiFi-only or 3G ("Cellular")?
My iPad 2 was a 32GB WiFi-only model.
For my iPad 3, I went for the 64GB WiFi-only model.
Given the lack of user-upgradeable/removable storage, you need to think carefully about whether you need 16GB, 32GB, or 64GB. Will you install a lot of apps? Will you store a lot of video on it? Do you want a big one you can stuff full, or would you be happy with a smaller one and just re-syncing more often to change the content.
I do think that 16GB is too small for anything other than basic browsing etc. You won't get a lot on it, especially as many apps are increasing in size to work better with the "Retina" display.
32GB is a good compromise between size and cost. Not as small as the 16GB, not as expensive as the 64GB.
WiFi-only or "Cellular"... Where and when will you use it? Can you make do with WiFi at home / work / coffee shops / hotels / McDonald's etc. etc., or would you also need 3G connectivity for use in other locations? Consider also that the "Cellular" model costs an extra £100, plus you then have PAYG/Contract data charges on top of that.
Do you have a smartphone at the moment? If so, do you have a tariff that allows "tethering"? (using the phone as a modem).
My O2 tariff allows tethering, so on the odd occasion I have my iPad somewhere without 3G and I want to go online on it, I just tether it to my iPhone.