Final advice for my purchase (iMac)

once again, hello all!
arrival of long awaited "back school" promotion ready buy new imac. asked advice on forum regarding future mac purchase few months ago wanted hear different opinions come final decision on product get. so, without further ado...

1) oriented towards getting base 21.5" imac model more adequate general computer use (academic writing, internet browsing, watching movies , tv shows). however, kind of interested in trying out games on (e.g. civilization v , starcraft 2). benefit purchasing 2.7ghz model better graphics card in sense? take consideration difference in price between 2 me of £220 ($355).

2) hypothetically, if decided go 2.7ghz model, advise me upgrade 27" model, considering difference in price between 2 "only" £132 ($213)? must admit found 27" screen size kind of intimidating whenever looked @ in apple store , don't have lot of desk space available me @ moment.

3) regardless of whatever model picked, worth upgrading ram 8gb? know in future cheaper price, wondering if 4gb of ram become obsolete in short term or not.

4) know if apple running printer rebate promotion in uk @ moment? there seems option buy printer mac promotion whenever go onto online store think might mistake can't find information elsewhere.
also, given £65 voucher app store receive purchase, there games or useful programs recommend on there? looking @ "scrivener" , wondering if of given have write final year dissertation soon...

usual, thank in advance help!

 

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yes, yes, yes, , don't know.

 

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