Your best option would be to try a few out IMHO. Fluke, Megger, Kewtech, and other makes are out there and all have versions that do the same jobs. Which features you'll need can make a difference to the cost. It's a big investment but as said above when it comes to choosing, personal taste will be the decider.
Don't knock the extras that may be on offer through the wholesaler though. If any freebies are included like extra test leads, test adaptors for light fittings and sockets, MCB locks etc then grab as many as possible!
FYI I have a Fluke 1653 which does me alright, but with hindsight I would've chosen a Megger.