Equipment I haven't thought of that will have the biggest impact for a beginner

Greetings,

I have competed in 1 Sprint Tri (Tri-It version) and will be doing at least one more Tri-It and at least one Full Sprint, maybe two this season.  I am wondering what I might get next to assist me in my training and upcoming races. 

I will share with you what I already I have so you can provide me your thoughts on what equipment I should invest in next that will have the biggest impact.  I have a new road bike Giant Defy w/ entry level acccessories, with Clip-on Aero bar (Profile Century), clipless pedals, bike shoes and a Profile Aero Bottle up front.  I have the Tri-shorts and tri-tops; two pairs of running shoes.  Pretty good pair of Aqua Sphere Goggles.  I will mostly likely continue to rent my Wetsuit at least until the third race.  I tried a full wetsuit my first race and will rent a sleeveless this next time althought one size smaller just to try it out.  Love my Tri-Bag from TYR.  My wife is wondering if it will ever end. I told her of course not!!!

Oh I am joining a fitness club with a year membership; I have been on a two week promotion at the club to try it out and have been going petty much daily.  Allows me to swim, attend spinning class once a week to add to my biking and lifting weights.  I can run inside if I need to or use the spinning bikes when the weather is nasty.

So given all that do you have any thoughts I what I might invest in that will assist me in further training and racing.  Feel free to tell me nothing and my wife will be estatic, but only if you truly believe that.

Thanks,

TriGuyBri