30k buys less and less of a tractor nowadays, as new ones get dearer, secondhand values climb too. If you are looking for a very straight tractor, age becomes less of an issue, 10 year old tractors with less than 5000hrs are making up to and over €40k depending on spec and condition.
30k gets you a very nice 15-20 year old tractor,
in no particular order, i’d look closely at the below
New Holland TS115
John Deere 6510/6610
Massey Ferguson 5475
Deutz Agrotron 120 MK3
Case IH CS120
Same Silver
choosing which one suits you, based on local service, price and spec. Most of the above are the last of the ‘mechanical’ type tractor that are relatively easy to keep going. But as such, nice ones make decent money.