1. 9k is a FAIR price for Spica. But in the current timeframe, but it ONLY if you want to play around with it. However, for 9k its still better than most of the mobile phones available in market (in that price).
2. I used to install .jar files in some old Nokia and Samsung phones by simply executing the desired file. If Jad Maker is not working for you then apologies as i dont have any solution to it. However, I'll try finding it on google and will let you know if i find anything useful.