I'm with megawatt on this one (Bandit 600) - it's your first bike, you are highly likely to drop it on the drive or in front of friends! It's best if your first bike is fairly cheap (to buy and repair), otherwise you'll become afraid of the cost and your long term biking experience will suffer.
I actually started on a 400cc despite being a little of 6ft tall (I'm not the only one), because bigger cc's can distract you from the other sensations, such as balance and control, it can make you a better, safer and happier rider (I admit I was poor at the time too!). I know many MANY riders that jumped straight on a 600, they either took ages to become good riders or never did and are only adequate riders.
That's just my opinion though OK! Congrats on passing your test by the way!