Welcome ... youll find loads of helpfull people and info on here( some even about boats ! ) - we dont all agree all the time but thats what makes it good
I'd by no2 ..
I like the newer small 4 strokes and no faffing with oil anywhere in the system ( tank etc ) & 60hp should be 'enough' to get you to 30knts.
The boats not really designed for heavy seas where you may need the extra bit of power - its really for nice days leisure only .. which if thats what your going to use it for with the 60 should be quite economical & quiet etc ...
As soon as you get it you'll want a bigger/faster more powerful one anyway - its one of the rules of boating....
There are +'s for the 2strokes ( lighter & quicker power delivery etc )