Slider- Do you want to be a big fish or a little fish? If I can run with HPDE3 I know that you can. HPDE4 gets a little bit too aggresive for my style. However, I think that you could hold your own in HPDE4 also. HPDE4 has more race built cars. HPDE3 tends to be mostly street cars.
You will be bored in HPDE2.
Technically, NASA wants everyone to start in 1 and work their way up. I think if you list your expereince HPDE3 should not raise any flags. 4 might be another story.
NASA requires a $35 annual membership on top of the registration fee. Which is a bummer, but at least it includes a subsciption to Grassroots Motorsports mag.
I just added an extension plate to the throttle pedal. Should help with the downshifts.
Stiffer springs (1LE) are on the way.
I've got two subwoofers on order to go along with amplifier so that I have more ballast over the rear wheels

Bring out your HotLap
[transmitter!