On your specific items ... meh factory audio, yes on rear pad walk thru,

Working off a Sivs list ...

The surf package .... Flow 2.0 WITH ibs. The decal is whatever floats your boat but you want IBS
I've been told the 400 is sufficient when propped right unless at high altitude. That was in reference to the Mojo.
Seat - Seat is swivel and heat is not an option.
Interior - Snap out carpet vs nonskid. I'm not sure
Heater - I'm a always want a heater type of guy. We use ours all the time.
Racks - The clamping board racks are possible but they will say Supra on them and are silly pricey. If you are looking at the builder, you have to do the fixed racks at 630 and add the swivel for 400 for swivel board racks. If you want the additional set of racks you have to add another 630, they cannot swivel. Also, you can only add the upper racks on the S-bend, not the aviator 2
Covers - the trailerable cover looks good from what I've seen. The two piece cover will put buttons all over the boat. If you want just buttons on the bow (bow cover on cold days to help with wind and heater), then that is the tonneau cover.
Audio - I, personally, would just make sure it has the bow speakers. Towers come prewired whether or not you order a tower audio package. I've always thought aftermarket does a better job matching components but it has been a while since I've seen a factory system.
Trailer - Several options depending on your style. It seems like a good idea to add the transom step for ease of access. Supra does this.
Lighting - there are several small lighting options. I think click them all. Tower lightbar is up to you, but only avail on Aviator 2.
Tower - Aviator 2 vs S-bend. S-bend is taller and only option if you want the z5. Aviator 2 is standard tower. S bend will have an overhead/cabin light where the aviator won't.
Other thoughts - Metalflake I go back and forth on. I don't understand why depth finder is even an option. As I understand, fire suppression isn't as big of a deal with the newer engines and mostly ordered on international boats. Shipping cover is added no matter what.
Other Musts, imo - no skid pacakge (gunnels and bow), pop up cleats, bow filler cushion, removable seat back

I'd likely opt for GPS cruise over Moomba cruise. I'm not sure if they both have the steering wheel column lever or not. I know the GPS does.