I'm guessing the price differential would depend on brand, features and quality, so a bit of time on the Hudson's Bay, Sears, Rona, Home Depot, etc. websites would probably give you a good sense.
Keep in mind that one of the advantages of a front loading washer is that it uses less water, detergent and hydro. If what you're paying for water and hydro through your condo fees is not tied to usage, then you're not going to get any bang for your buck from the front loader (other than the environmental satisfaction of using less of the earth's resources).
Also, the door a front-loading washer needs to be kept somewhat ajar when not in use in order to dry out properly and avoid mould and odours. Depending on the space configuration in your condo, would this be a problem (i.e. would it prevent you from shutting the door on the laundry closet?) - also something to keep in mind if you have curious pets. Also, you might need to buy a front loader with a reversible door hinge (a lot of models are only available left hinged) - in a condo with tight space, a left hinge might not work very well with your layout.