Thats better.
you will need to learn to ride all over again after learning on one of those chinese heaps.
Car maintenace is not really applicable,
The myth of british bike un-reliability is spread by the sort of half wit bodger we all become familair with after we buy one of his 'restored" bikes,
I have been riding british bikes for 50 years all over Europe, never been let down, and they come back covered with road dirt not oil.
you can get a damn good bike for under 3k but it depends what you want, and what you are able to kick start, no poofy electric starts.
I would suggest a good 350 single, Ariel, B31 Matchless, all have good spares back up and have good owners clubs.
If they look to be too heavy a 350 or 500 Triumph as late as possible, say a 3TA, Tiger 90 or Speed twin might suit.
Personally I dont think modern Triumph spares are as good as they should be which is a drawback.
If you are concerned about style a 1970s Triumph Adventurer will absorb most of your budget
Are you in the UK if so where?