Yes the Aston's are getting annoying but im also getting sick of seeing all the various Porsche's as they all look the same and Top Gear review them far to often. It would be great to see afew more beamers, Volkswagens, Vauxhall's, Fords, Mazda's, Toyota etc as some of Top Gear's best reviews come from the cheaper cars.
Have to agree with you there about Porsche's, more specifically 911's. Anything below a Turbo, GT2/3 and RS simply bore me and TG's featured them too often.