Yes, i know about wasteland 2 but im not interested in games that are in beta, but once its out of beta, its day 1. Jagged alliance looks very interesting though.
Note, that its Jagged Alliance 2, the original is not as good.
Note also that JA2 is a huge step up from Xcom - and basically anything else in the genre, including Silent Storm - with regard to complexity and learning curve. But it all pays off, and with the 1.13 uber-overhaul, with full customizability of options through an easy-2-use XML spreadsheet (thanks to them having access to the source code) there is no comparison to the awesomeness and replayability of the game.
JA2 also seems to have a presentation well ahead of its time, I've never seen a better UI (closest is Temple of Elemental Evil and Neverwinter Nights 1) and the various voicesets and personalities of the mercs are highlights. Yeah, its a ****ing awesome game, I can't say enough good things about it, really, so I'll just shutup now.
You could check out Xenonauts as well. It's pretty much a straight up remake of Xcom: UFO Defense. It's supposed to be a release version by the end of the month. --- http://penguinpetes.com/gallery/MyWalls/pigeon_chess.png
Do you have PS3 or PSP/Vita? Get Valkyria Chronicles (PSP has the sequel, which is not as good). I read that the creator of XCOM said it was similar to his original vision for Xcom. --- Touhou is love. Welcome to Gensokyo!