Use the training schools bikes and if possible hire one for a few days before lashing out serious money on a bike of your own. Invest in the best kit, it really does make a big difference. Get a proper helmet that fits properly, the comfort factor really is important, if you can't wear it without being distracted it can be dangerous.
As for bikes my last one was a Triumph Trophy 900, looked great without the panniers and when they were fitted it carried enough gear for a fortnight, went to Benidorm, Prague and Amsterdam on it.
After passing your DAS and test, take some advanced training with the IAM, they aren't all bearded BMW riders!!! Up here in Durham the IAM for motorcyclists is assisted by the police, in fact a bike sergeant takes you for your test, it's a great scheme and it does make you a better rider, and when you understand the road problems of those on 2 wheels it will make you a better, more observant car driver.The trainig is about making progress safely, I ended up riding much quicker than I used to, take extra training whatever it costs, it could save your life.