Actually start with more basic questions regarding the reality of who you are, be honest, what makes you ... you?
Actually, we use "Kings English" here and don't measure in stone and stuff ... .... but by the above, what I mean is quite serious when shelling out a bunch of pound notes, quid, or whatever.
First is how many times do you plan to use these skis? Be real; a lot of guys talk like they are totally involved and then shell out $1,000 for gear that collects dust. Do you have a habit of doing that.
Where do you want to be .. in say .... three years (based on above) ... ? That will depend on what shape you are in and your general ability in most sports. It sounds like you did quite well so ....
What kind of conditions / hills will you ski? Each region will have "typical" conditions and the skis all perform quite differently. I know the Alta ads promise endless days of powder and all that but ... where will you be?
There is a method to my madness. I assume you are from NZ? (a belated ANZAC salute if you are). If you are only a holiday ski type and you are going to ... or have to .... travel to the snow, it may behoove you to lease/hire for the week. Consider just buying a great fitting boot and use that as a base for all future endeavors. Example ... I used to ski the east .. lots of powder ... just kidding .. all slush and ice with emphasis on the ice. Up at Stowe we were getting an unexpected powder dump, so I hired some very up-scale (LaCroix), powder skis. Good move cause I could never justify that much $$ back then.
And you are lugging a lot of gear traveling. Many areas have shops close to the hill that will rent upper end .. once I rented Stockli ... and will not be chasing every change in color, top sheet, and sidecut or change in flex.
Let me dial this in one last time. If you are good, and start developing rapidly, you may out grow the ski in a season or two. What is good for you today .... depending on how many times (of Brit stock I'm sure you are taking lessons?) ..... you go. A shop will be more than happy to put you on beginner or low intermediate sticks that are fine for right now but that will change.
Have we mentioned boots? More than just "gimme' a 10 anna half, I'm always a 10 and a half.. skinny upper, lot of arch ...here BRAND (to a larger point than you figure) ... you will need to start thinking of volume and flex. Tight is your friend, and loose can put you in the trees. Tight = GOOD & Loose = BAD ...