o if you have any apple computer with a newer version of osx then you can use that to download a newer version of osx from there you can go around upgrading your imac OS if you want to try to do it for free. (like your macmin if it's ruining a newer version of osx you can use it to download a version of osx)
i have relay mixed feelings about the external SSD once your spending £200 thats close to 20% of a new imac
for instructions on ram upgrade look here
https://www.ifixit.com/Guide/iMac+Intel+21.5-Inch+EMC+2428+RAM+Replacement/5660
nice photos and looks like a simple upgrade (think thats your imac mid 2011)
on ebay you can get ram for you imac fairly cheep, i think you have two 4 gb sticks of ram with 2 free slots (no 100% on that) i see two 2GB sticks for £20 or two 4GB sticks for around £40
thats the cheapest and id gess best/easy upgrade but as your a light user id relay suspect that your better off just upgrading the OS and seeing how things are, skip on upgrades and put the money to the side for when you need to replace the imac.
with osx10.8+ your will have more software to use and maybe even better browser support.
(but some old software may stop working)
one of the nice things about osx is apple dose make it vary simple to update the OS, so it's not a big thing.
i have relay mixed feelings about the external SSD once your spending £200 thats close to 20% of a new imac
for instructions on ram upgrade look here
https://www.ifixit.com/Guide/iMac+Intel+21.5-Inch+EMC+2428+RAM+Replacement/5660
nice photos and looks like a simple upgrade (think thats your imac mid 2011)
on ebay you can get ram for you imac fairly cheep, i think you have two 4 gb sticks of ram with 2 free slots (no 100% on that) i see two 2GB sticks for £20 or two 4GB sticks for around £40
thats the cheapest and id gess best/easy upgrade but as your a light user id relay suspect that your better off just upgrading the OS and seeing how things are, skip on upgrades and put the money to the side for when you need to replace the imac.
with osx10.8+ your will have more software to use and maybe even better browser support.
(but some old software may stop working)
one of the nice things about osx is apple dose make it vary simple to update the OS, so it's not a big thing.