@ krendel
If you are finding the DA 40 a bit tight for indoor shooting there are a bunch of lenses, less expensive than the FA 31 you might want to consider.
FA 35mm F/2.0 and/or the DA 35mm F/2.4: these are both very nice lenses. The DA 35 was made and is marketed as an introductory prime, it has a plastic mount, and is light and small, in addition like the kit lens it doesn't come with a hood, nor does it have the very useful DA shift mechanism. The FA 35 has a metal mount is about 1/2 stop faster, and has a better reputation (actually in real world application less than that as the DA 35mm f2.4 test out at about F/2.2) I own both these lenses and I can say that I personally prefer the DA 35mm F2.4, I will be selling the FA 35mm sometime soon.
DA 35mm F2.8 macro. I don't own this lens but it comes very highly regarded, most people consider it VERY sharp, good bokeh and in addition, a true 1:1 macro. It is also relatively expensive (tho not in FA 31 terms!)
The 30mm F/1.4 Sigma mentioned by Frogfish. I have never used this lens, Take Frogfish's opinion and also check it out on our lens database.
linky
note that there are two different versions of this lens one with hsm (in lens focusing motor) and one without. I linked the HSM version but I imagine the non-HSM version would be cheaper
There are a BUNCH of good fast primes in the 24-28mm range, too many for me to mention except that I personally own the Sigma 24mm F/1.8. This is a very good lens, quite sharp in the middle, soft around the edges wide open. It sharpens up a bit stopped down but still softer at the edges than I would like. Bokeh is good, like a lot of Sigmas it's somewhat flare prone but with a good "normal" hood it's not too bad, and the normal hood (standard rubber collaspable) I use doesn't vignett. It' is also a good close focuser, but I wouldn't buy into the marketing hype of it being a "macro" lens. It's main downside is that like a lot of sigma's it's huge, it feels twice the size of my FA 20mm F/2.8.
NaCl(if the FA 31mm ltd doesn't suit, there are many many alternatives)H2O