thank you all for your very kind and helpful comments for a noob like me.
you guys are right in the sense that weight might be a issue for my missus, and i would want to satisfy the tech geek in me to see what i can achieve. NEX is a very good camera, at least from what i can see when i pop by shops, but i am also concerned about the limitations of the lens' ranges.
my budget is around 1.4k, and NEX along with Canon 550D is within my budget.
thanks for all your comments and advices. really really appreciate it.