Personlly I think the MC18's are the best but they don't demand the price of the other models.
Their prices have increased though compaired to what they were even 5 years ago.
I'd say a R5k is worth anywhere from £1000 to £2000 depending on condition. I've seen SP '18 advertised for much more but havn't seen many sell.
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If I have to take the carbs off once more...