Jayco Expanda options

Hi everyone,
Hubbie and I are in the process of working out what we want in a Jayco Expanda 16.49. Nearly ready to order but we are undecided on a couple of options.
To get in under budget do we stick with the cupboard air con or upgrade to the roof air con and not get the hot water system with external shower.

I am after suggestions for and against.

So abit about our travel plans:
two - three weeks a year mainly in caravan parks
around six weekend trips a years preferably free camping.
two adults and one fur baby.

Thanks in advance for your assistance,
Michelle