Hello mate. I was in the market for a Bug wagon, looked at a load and found that they were in pretty poor condition. I, like you was looking towards the lower end of the Bugeye market and after a while I bought a saloon because I couldnt be bothered to look at another shed.
The good news is that you are looking at the best Impreza (!), the bugeye. Just take your time, dont jump in and MOST IMPORTANTLY take an enthusiast who knows all the questions to ask, pitfalls and dodgy areas of the car etc. He/she will be invaluable and will probably save you throwing £4k on a shed (you will see loads at that price, but there are some gems also)
Good luck, dont look to another marque, owning an Impreza is a rollercoaster ride that every driver shoud experience.