Seems high.
A 49cm bike?This would put you roughly 5'-2 to 5'-4. Seem right? How does it feel?
The open pro's would be ideal for someone 200 lbs and up.
The Arenberg does have a reputaion for seeming flexy in larger sizes. Mine is 53cm and I don't notice any objectionable flex at all (I'm about 165lb).