I can recommend a DB 990 Implematic, excellent machine if you get one in good working order, just make sure the dual clutch is working ok. I would avoid DB 990 Selectamatic, they had problems. I had a (Hunting Pink - pre. the Case white version) 990 Implematic for years with hydraulic foreloader that had been converted to positive hydraulic bucket up/down, much more useful than the gravity release. It did everything I wanted with ease. Spares are available so no real problems there, as are the spares and workshop manuals (useful for identifying parts), there is also the David Brown Tractor Club. The only problem you may encounter is the price - This tractor is a favourite with the preservation/showing fraternity who push the price up, mine was sold on by the owner after me for well over a £1000, ten years ago!
I currently have a MF 575, at 66HP it's got a bit more 'grunt'.
Good Luck.