I looked at the front riders before,if I was to buy a dedicated mulcher this would be the type of machine.However,the tractor mowers are more adaptable,with most now you can bagg,mulch or even side-discharge. With mulching you really need to cut ever 5-7 days,sometimes this is not possible,so the option to bag is a good one. You can get a good 15-17HP 40-48" deck Oleo-Mac,Husquvarna,castlegarden,honda,etc. for about €2500-€3000. I also have a John Deere LTR180,mulch and collect,17hp V Twin,42" cut mower which I bought this year for €5000,great machine,I cut other people's lawns also.
Buy the best you can afford,you won't regret it.