Between the 240 and the 230 it really depends what you want. The performance between the two is nearly identical and the wake is also, and with only a few thousand difference between the two it really boils down to which boat you prefer (if you would rather have a smaller one that is slightly more maneuverable).
Next, when it comes to the engine it really depends what elevation you are running your boat at. If you are running your boat over 3,000 feet then the 6.2L engine really does make a big difference, especially in the SV240. We are running ours at about 4,800 feet and a 6.2L Scorpion (340 HP) is a must up here - in both a 230 and 240. Some of our customers are even deciding to run the 8.1L High Output engine. Overkill? Maybe, but some of the lakes here are 9,000 feet - and at that elevation you need all you can get.