Depends hugely on the budget. Also there aren't many planes suitable for what one might call "real IFR" which you want to operate from 700m grass (i.e. mud during a large part of the year in the UK).
There isn't an insurance issue with retractables, and again not going for a complex aircraft limits the field if IFR is desired.
Except for not wanting to operate something half decent from mud, a TB20 is very very hard to beat for excellent IFR capability combined with versatility (500m tarmac at MTOW).