You don't need to do an integrated course. I did the modular route and 4 months after completing everything I was starting a job on a medium jet in the UK. There was no question of me paying for a type-rating. If you do modular stick with one, maybe two providers.
An integrated course may help you stand out in the present environment, however, an OAT spokesman was recently quoted as saying that, in the last 12 months of 270 odd graduates, only 80 or so have been interviewed/placed with an airline. An integrated course probably won't teach you quite the same skills that might be useful should you end up doing air taxi, parachute dropping or aerial photography - I don't think SPIC ever allows you to foul up your nav and be properly worried!
There is an argument for undertaking your flight training during a downturn, as you could be in a good position when you finish, if that conincides with the upturn. However, we are still waist deep in the doo doo right now and it feels like we're treading water. Globally a lot of major airframe orders seem to be scheduled from 2012 onwards - putting off for another couple of years would do you no harm. Do your A-Levels (maths & physics not my strong point too, but being able to put them on your CV certainly looks better than Art or Media Studies!), get a part-time job, and if you can get a PPL under your belt over the next year or two, you'll be able to present yourself in a very good light to the bank, should you wish to borrow. Your required finance will also be less.
I completely empathise with your 'butterfly' feelings - I had those as well. But, you're only 19! Get being 19 out if your system, not so easy to be as wild as I was when 19, and be a responsible pilot. I didn't start until 25, and have no regrets. I'll certainly bring more life experience to a command than if I had seen nothing but aviation.
Good luck.