Assuming you already have used both a SLR and a TLR (your 124g), if you like the TLR, get the TLR. It's all about what works for you. TLRs make great party cameras - 2.8 is fast, the TLR is stable (i.e. slow shutter speeds possible), and people relax a lot more around TLRs vs SLRs.

Of course, IMO the SLR is a better general purpose camera, but if you like a TLR get what you like, otherwise you'll regret it. Both have excellent glass.