It really depends on your budget. If you have $2,500 to spend, you can get a modified conservatory instrument that's 3-8 years old in top condition. Modified conservatory has almost all the keys, including left F, and are usually missing only a few keys mostly used by professionals, such as the split ring, banana key, or 3rd octave. A modified conservatory instrument will serve you well until you become a very good player and need a professionally equipped instrument. For $3-5K, you can get a new instrument or a used professional instrument. A Loree will run you about $8K these days.
I also recommend that you consider a plastic instrument. Contrary to what you may have heard, top makers like Loree, Marigaux, Buffet, Yamaha, Fox, Howarth, Fossati, and Bulgheroni offer all-plastic or plastic top joint instruments that have a great sound and feel, with the added benefit (especially for a student) of being impervious to cracking.
A very good vendor is Hannah Selznick, who deals in pre-owned instruments. She can send you a list of what she has available in your price range.
http://www.hannahsoboes.com/