Hi,
I've been a 3d modelling/rendering specialist in the architectural industry for 6 years now.
Contrary to what you say, and it may not be obvious, there are in effect some industry standards.
Architectural Visualisation = 3ds Max.
Games + Film = Maya.
Engineering = AutoCAD 3D (although there are many very specialised 3d packages for the various engineering industries.)
You do get companies using other programs, or say, using Maya within Architecture, but as a rule stick to the above.
Traditionally 3ds Max has tended towards the more technical and maya towards the organic, and most companies still hold with that, although in reality both programs perform perfectly well.
You can download the latest versions of Max and Maya as a trial copy from the Autodesk website, if you like either enough then obviously I would have to recomend buying it properly! (ahem, if however you can't afford the 3 million pounds these packages now cost they can be downloaded from most good torrent sites!)
Try them out and get a feel for which you prefer, they are all great and it's a great job if you can find work. GO FOR IT!