The Blues' future in goal

During the 2012-13 campaign, the St. Louis Blues saw three different men start games for them in goal: veterans Jaroslav Halak and Brian Elliott as well as youngster Jake Allen. They thought enough of what Allen did -- a 9-4-0 record in 15 appearances, with a 2.46 GAA and .906 SV% -- that they signed him to a two-year deal this offseason, after which he'll be an RFA. Reportedly, the deal is two-way in the first season (meaning that he can be sent down or brought up from the AHL without having to clear waivers), and one-way in the second (meaning that he be subject to waivers). So how do all the pieces fit together when considering 2014-15 and beyond?