Jeremy: I doubt those extra mods will help much. It all comes down to your launch. I say get to the track now "before" you add the mods. Two words of caution: it's SLIPPERY!
I went to the track (LACR) for my first time just a few weeks ago and was very disappointed. And I've got all the mods on your wish list too..including Mugen. I trashed nearly all my launches and even bounced of the rev limiter a few times..something I "never" do on the street. Don't expect anything better than 16's or 15's and you will have nothing to lose. Plus, if wait for all your mods first, you will expect alot more out of your car. And even Mugen parts won't get you off the line...it's all driver skill. My best 60' was around 2.5. You've got to beat that to break into low 15's and get 60' times closer to low 2's to get into 14's. It's not as easy as I thought.
Let us know how it goes. Hopefully I'll be back to the track soon. I've been practicing 4500 rpm drops on the street with good results. Good luck