[YetiUK]

I am looking to purchase a Blackberry for work use and would like a couple of queries answered.
Firstly, I am based in the UK. I run a small charity and want to implement push email for 1 user (me!) as cheap as possible.

We run our own exchange server, and I understand I can install Professional Software Express free for a single user. Is it better to install on the exchange server, or a second server?

I travel aboard, and want to retrieve my email. I always have wireless access when abroad, if I buy a 8900 can I retrieve email without having roaming charges?

In the UK I will need a data plan as I won't have wireless access most of the time. Is there a provider that stands out for cheap data plans, or is there any one provider you would recommend. I live and work in London, and have an orange and t-mobile phones, both perfect reception if that helps.

When I purchase the phone, I need the blackberry add on, but as I will be running my own bes server what else do I need to ask for?

Anything else I should know?

Gratefull for any replies
YetiUK