I prefer the 8x8 frontier because it is lighter up front than an avenger. The 23 briggs has a lot of potential, it could easily put out 30-45 hp depending on build and be long term reliable. Tim @ Adair Argo says it swims faster than an avenger.. that may have been with the bigger avenger tires on it..
If you got the bigger tires, you might want the lower geared/higher ratio transmission.
But a stock model/stock tires should be a great machine. Argo has a factory $1000 off deal this Fall..
To Invent, you need a good imagination and a pile of junk. (Thomas Edison)