Replacing aluminium Windows in 1968 house

We just bought a 1968 house in pretty much original condition. The aluminium sliding Windows are in very poor condition and we'll need to replace them with double glazing. From what we've read, the advice is to choose Windows that match the architecture of the house....we'd prefer to install timber awning Windows but not sure what this will look like. If we go with aluminium can we go with awning style or are we best to go sliding? Any thoughts would be appreciated.