If its heavy clay then going straight in with the combi will probably not make a great job and really wear your metal. For 190hp, you could manage a 3leg subsoiler and some type of disc based kit like a topdown (?), or just a simple set of discs and trailed press. A lot will depend on your rotation and trash management, for example a long rotation with pulses, rape, linseed, wheat and barley will be a lot easier to manage than continuous wheat. Also depend on you giving up the plough or not, as to get the full benefits you want the plough in the nettles! A rotation of wheat,barley,rape,wheat,linseed - taking the barley straw off, and you can avoid plouging full stop.
Personally I would ditch the tractor and invest in a 250hp crawler to do the work as you have the acres to justify a small machine. Then a 5 leg subsoiler would do the job too and you could use it to put the rape in, and beans if you want. If you do choose to put winter or spring beans in with a cultivator then you could easily have a 6 crop rotation which would let you grow some colossal wheats!
Freeflow or a 4m disc drill will be well matched. Again, a lot depends on your view of trash management IMHO.