Just about any old analog or digital oscilloscope would suffice so long as it is dual channel (alt or chop is ok, lissadous would be nice too, don't all duals do this if memory serves?) as I do a bit of work comparing the phase of multiple signals.
Every 2 or more channel scope I've ever seen will do X-Y, which allows you to do lissadous figures. A number of scopes also have a Z axis input on the back, which basically modulates the beam intensity. With the X-Y capability, and Z axis as well, you can do pretty much anything on the screen, pictures, text, etc.
I don't know your market well there, but here in the US, one of the overlooked venues for electronics is craigslist. I occassionally see really great values there. I picked up an Agilent 34401A 6.5 digit bench DMM for $300. It is just over a year old, and in almost brand new condition. Perhaps you have some local "For Sale" forums like Craigslist that have lots of people selling tools and electronics. Of course eBay is always a place you should watch, lots of stuff there, but also plenty of others competing. I've even picked up some bargins on Fluke DMM's in pawn shops here in the US.