Hi guys,
I'll get straight to the point and say i need help

! Yes, having done a decent amount of travel i find myself in need of advice for my next trip. We (girlfriend

and I) would like to do a Canada/States/Central America combo and the details are:-
1, It will be from end of Jan til end of March 2010
2, What is a reasonable itinery for that type of trip? We are happy to be 3-4 days in a spot before moving on
3, Advice sought on where to start ie move up from Central America and depart from Canada or vice versa - flight prices will influence this (we will be flying out of and back to London)
4, Weather is an important factor too so keep it sunny people!
Any advice would be warming received, although we are pretty set on the location, other places would be considered, although we have done South America, Asia, Oz, NZ etc before and this seems the last place to cross off the list. However, a possible Russia/baltic states/China option tempt us too
Thanks in advance
Jeff and Sarah