I wouldn't rush right out.
At this point, your child can still RF for a LONG time in the scenera.....probably a YEAR or more....so you really don't need to buy one unless the money is just no object for you and/or you are just really wanting to get one with side impact protection or EPS foam or something..which are nice features, but not necesary........
When the time to FF is met....then you should probably look for another seat....at that point, she will likely be 2.5+....so I would not necesarily get another convertible, but a long-term use seat...like a Regent, radian, or possibly the mythical new Recaro seat due to come out in May......
the reason I say that is because getting a convertible Britax won't be as great of a value, since many kids are outgrowing it by 4.5 or so..and if your child is already 2.5 or so....then you are only getting about 2 yrs out of the seat....whereas something like a regent, which is cheaper than a BLVD anyway, will get your child until 80 pounds or about 8+ years old.....basically, until a carseat is no longer needed!!!