Welcome to the forum!
On a limited budget you should avoid diesel and probably go for either something Japanese (better chance of getting a reliable one) or a Ford Focus (lots of them around to choose from). You could also consider the Vauxhall Astra, but these aren't as good to drive as a Focus.
If you're looking for a car the size of a Golf, the Mazda 3 would be better than the 6: the 6 (as long as you stick to petrol power) is a good car but bigger than the 3.
I don't know why you specify the Golf SV, given that the ordinary Golf hatchback is the same size as an A3 Sportback. VWs and Audis are more expensive than Fords and Vauxhalls of similar vintage, although the SEAT Leon and Skoda Octavia with the same engine will be cheaper. If you are set on a VW Group car, ensure it has manual transmission.
As your froends have told you, Alfas don't have a good name for reliability.
Always remember that condition is ultimately more important than make or model.
Edited by Avant on 12/01/2018 at 14:44
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