Irish bouzoukis and citterns come in a wild variety of designs, but the instruments in the lower three price ranges are nearly always of the 8-string long-neck variety. The scale length may be a bit too long for many people's taste and you might want to consider an octave mandola instead, especially if you're mainly going to play solos.
The top
The most important thing here (for all kinds of stringed instuments) is to make sure it's got a solid wood top. Instruments with a laminate top are only recommended if you're desperately short on money! This is rarely a problem when it comes to the Irish bouzouki though. Nearly all of them have a top of solid spruce or solid cedar. Both these are excellent choices. You may come over other kinds of wood from time to time and if you do, ask the seller about it. There may be good reasons for an unusual choice.