Couple more to add to the mix
5 metre Seafarer Venus, 4.9 Goolwacraft Sahara and if you go to 5.5m -
http://www.pmmarine.com.au/evolution/
http://southcoastmarine.com.au/?id=goolwacraft&sid=new
http://www.raeline.com/models-cseries186.asp
These Rae Lines are sold in Aus, nice Kiwi boat.
The Evolutions are by accounts excellent value, designed for fishing.
My preference would be either the Goolwacraft Sahara 5.3 or the Venus for a 5m.
Have fun with your choice, the range is endless and worthy of maximum research!
These are of course only mono hull options!
Personally I'd go for an outboard, being the devil I know better.
Cheers.