I have built dozens of kits from .049 to Giant scale and I can not recommend you a better airplane than 4* 60 .
It is big enough to see it in the air yet small enough for easy tramportation . You could have a relaxing flying with a small engine but really tear off the sky with a .90 , mine have a magnum 1.20 !!!!
It is a kind of airplane that you could take to the field every week for years.

Be careful building is addictive..........