I think you'd really enjoy building and flying the LT-40. Later on, when you think you've outgrown it, you can put it on floats or skis for the winter. The .46FX is a very good engine for this plane too as is the radio you have chosen. Both will carry over well into future planes if desired.

Ken has that great build thread. There is a bit of colorful clutter in there (I helped with that) but it was a lot of fun and very educational for those seeking building skills IMO.