I really like the 144/145/Classique range nice pens, and I have many of them (I did a post but I think those bar stewards at Photobucket blocked the photos because I refuse to pay their outrageous price and they won't allow me to bulk download my photos - sorry a rant for another post!).
I think they are good place to start with the MB brand. Sensible used prices, and a vast range of nib sizes, finishes etc to choose from as taste and budget allows.
I have models ranging from solid platinum and the Meissen porcelain annual editions through to the sterling silver, dose and more recent solitaire models. My current favourite is the UNICEF due solitaire.
The 144 is a great pen, but is fairly small and slender. The Classique/145's have a little more girth about them.
What started my MB journey was purchasing a 144 with a monotone BB nib from another forum. A fairly firm-ish nib with amazing stub like qualities, but not too broad. the newer 145 BB's run much wider.
I recommend attending a UK pen show to get one if you can there are good deals to be had for cash and you can hopefully dip test too. I think patience will reward you with a pen in good shape for less than the GBP equivalent of $175. These pens seem to be faked quite often so be careful. Go with trusted sellers and do some research.