In all honesty I would go for the 5.3 there is going to be more useable space over the 5 I know it dose not sound much 30cm but it makes a difference.
Only you can comment on the choice of console as this is all down to how you are looking to use the craft… ie. If you are planning to take 3 mates out in a nasty chop then a single seat setup is no use.
The e-tec is a good engine however the deals on new Opti can’t be overlooked and if you are going new the 5 year warranty is a huge plus. And as a 90 and the 115 are the same kg go 115.
In summary go with your hart…. Your head will get over it.