You forgot insurance, assuming you have insurance
I got everything done on the cheap side as well.
Retail I Paid
Helmet: $400 $100
Jacket: $400 $51
Boots : $240 $109
Gloves: $80 $40
Pants: ? ?
Total : $1120 $300
Got a 2000 Kawasaki EX500R for $1800 and spent about $200 tuning it up, so we'll say $2000 for the bike.
Insuring it cost me a whopping $120/yr
So all in all for everything it cost me about $3240 US.
Definately take the MSF BRC course, it can save your life. And many insurance companies offer discounts for taking it (but not mine...).
Next, wait a while for that ZX-6R. The bike is awesome I will agree, but wait until you have the skills to handle the bike. Even my EX500, which has a little less than 1/2 the horsepower than the ZX-6R is a beast to handle at times. Everything about the ZX-6R is bred for speed, so much so that if you do not know what you're doing it can be extremely hazardous. Stick with something small. We usually suggest the Kawasaki EX250/EX500 and the Suzuki GS500 as a good starting sportbike.
Also, insuring that bike as an 18 year old is...rough. I'm 23 with a perfect driving record and getting good coverage on a new GSX-R600 would cost me about $3000/yr. Insurance companies know why people buy these bikes (in general) and therefore charge a much larger premium to insure them. When I hit 25 that amount would probably be...less than 1/4 that amount.
Also, as stated above by more than one person, look for a used bike. Not as much grief if you take it down (hey, that's why we call it a "beginner's bike, it's there to take some punishment!)
Good luck!