A lot of things really come down to personal preference, something that I think is great may only be ok for someone else. Having said that, if I was you (and I had plenty of cash to spend) this is what I would buy:
Shoes: go for some with a nice stiff carbon sole - I have the specialized s-works road shoes (I think they were about $400)
Lights: Ay-ups, you can't go wrong with Ay-ups
Bib shorts: I pretty much only wear castelli free aero race bibshorts, usually about $150 from
wiggleJerseys: Get one with deep pockets, I hate jerseys with shallow pockets that you can't fit stuff into. I like
TwinSix.
Computer: Get the garmin, I bought my girlfriend a 310xt for her triathlons and she said it was great
TT bars: If you are doing a half ironman then you will want some TT bars to get you into that aerodynamic position, I think profile are ok, I can't remember what mine are
Gloves: Yes, any short finger gloves will do the job for summer, get the ones you like the look of
Tools/puncture repair: Get some spare tubes, tyre levers, small multitool (with allen keys), mini pump. (And learn how to use it all). As mentioned above you'll need a floor pump too. Other things to consider - torque wrench, pedal spanner, chain breaker, cassette lockring tool
Maintenance: Chain lube (I use pro-link gold, but chain lube can be a very personal thing so use whatever you like). I would also recommend that you learn how the bike works, buy a book like Zinn & the Art of Road Bike Maintenance
And if you are really serious...
Race Wheels: Triathletes love deep rims, get some race wheels (Zipp 808s or any other deep carbon rims, Cycling Express have a special on wheels at the moment, $999 for
Reynolds Assault wheelset looks ok)
Aero Helmet: There are only a couple that have the aus standads sticker, specialized and something else (can't remember which), you will go faster (or at least look more pro, as long as you don't wear it backwards)
TriSuit: I'm not actually a triathlete so I can't comment on which are the best, but triathlon specific clothes are best for racing
Eyewear: Oakley Jawbones, Oakley Radars
Bike Bag:
Scicon Aero Comfort, you want your bike to arrive in WA intact
*note: I tend to err on the side of higher end gear, and it has worked out well for me, but be warned that once you have sampled the good stuff you are unlikely to settle for second best... this can be expensive

There are plenty of cheaper options available that will do just as good a job, but if you get this stuff you will fit in with the crowd
