I think it would be wiser to put together one list covering the Test match era and another covering the period prior to that. The game changed to such an extent over the last third of the century as to render any comparison between players of different eras little short of meaningless.
When W.G. Grace emerged in the 1860s, roundarm bowling still played a crucial role, swing bowling was non existent, googlies and doosras were yet to be discovered, lob bowling was a respected art form, and most fast bowlers span the ball. On the batting front, footwork was looked down upon, there were no leg glances and very few hook shots, and it was considered bad manners to hit good balls for runs or off side balls to leg. By the end of the century, top class cricket had evolved into something comparable to the modern first class game.
With that in mind, here are my lists:
Top 10 19th Century Pre Test Cricketers
Alfred Mynn
George Freeman
Fuller Pilch
William Beldham
William Lillywhite
Richard Daft
George Parr
Bob Carpenter
John Jackson
Tom Hayward
Top 10 19th Century Test Cricketers
W.G. Grace
KS Ranjitsinhji
George Lohmann
Fred Spofforth
Charlie Turner
Jack Blackham
Arthur Shrewsbury
AG Steel
Tom Richardson
Johnny Briggs
Grace has been excluded from the pre Test team because he played a larger proportion of his 19th century career during the Test era.