You'll really like the SP81,I know I was impressed with mine when I ran it the 1st time.My SP 81 is here and it's all I thought she would be! After giving it a quick test run I really want to get the last minor details on my 5-10 and 10-10 buttoned up so I can run the against each other.
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As for the 5-10 running against the 10-10 there should be no copntest,the 5-10 should win hands down against your 10-10,the reason being you have 70cc against 54cc.