the way I see it, the motor would cost at least £50 secondhand so u've got just a few quid in all that quality cast iron.....forget about the blade size arbour......u just get a couple of blade to suit and then just get em sharpened...they wont cost much for a qual blade with at least 5-10 sharpenings....most of the blades now are rubbish so buy better just once....
as for dust extraction not that many saws are that great as standard...it's easy to improve things....
I'd buy it in a heartbeat if I was there.....