Thank you to everyone who has replied, I've enjoyed reading them and It's given me plenty to think about.
Eddie, thanks for the advice, I'm definitely going for the 350.
PeteF, I appreciate that the 500 will be provide a better performance at top speed but I'm not too concerned with speed, I rode a 350 and a 500 in India and felt the 350 suited me better. I'll be content to just plod along and listen to the engine.
Matt, I loved looking at your pictures, that was a serious load you had on the bike. I'm planning to return to India and Nepal next year, I spent most of my time in South India and Rajasthan on my last trip. I'd love to ride from Delhi to Ladakh (on a Bullet of course). I've read a few blogs of people who have done it and it sounds amazing. What route do you take? DId you buy a bike or rent one?
MadMike, you're right there is plenty of helpful info on the site, a couple of members from midlandbullets have also been great. I'm not sure what response I'll get for telling you that no, I haven't got my license yet. I'm booked in for my theory on the 14th of Nov and my 4 day bike course starts the week after, providing I pass the theory! I hope you don't think I'm naive buying a bike before I've got me license but It'll just have to stay in the garage until I pass. It's all I've thought about since I got back from India and due to my job (marquee erector)...thats a genuine work title

I haven't had anytime to get my test done until now as the season is over.
A member form this site read my post and replied on Sunday night, he has a 2000 model 350 for sale, it's at a good price and only has 6500kms on the clock. Taxed and Mot'd until next May. Looks great in the picture, I'm going to see it on Thursday, fingers crossed it's in the van coming home with me. I'll let you know how I get on.
Thanks again,
Ryan