€900 will get you a decent bike, and for touring you need a decent bike.

You could bring your bike with you, It's usually possible to take bike on European trains, but you have rules that change from area to area, country to country, rail company to rail company and time to time.

One option could be to buy either a new or 2nd hand touring bike from St John Street cycles in the UK, they ship worldwide.

Get the bike sent to your starting point, ride the bike and then either sell it, or if you have got a decent Thorn or similar take it back to the USA where it will have appreciated in value, and you could probably sell it for as much as you paid for it, weather new or 2nd hand

http://www.sjscycles.co.uk/category-...-Solos-770.htm
They have some very nice 2nd hand Thorn bikes here (£1=$2 !) and if you give them a call and say what you are looking for and when there is a good chance they will keep they eyes open for the right thing

Potentially you could do the same thing from e-bay if you can find the right bike and get it shipped to the starting point.

Either way, a top of the range 2nd hand European touring bike is likely to appreciate value when shipped back to the USA in a suitcase, so you could get your money back plus a buck