the steel will be much better.
Heres a bunch of EBAY props less than $50
noote all props are differant. Even the identical prop can will perform differently. Need to buy, beg, and borrow then try and experiment till you find what you like.

http://cgi.ebay.com/ebaymotors/12-3-4-X-21-St-Steel-prop-for-Evenrude-Johnson-Used_W0QQitemZ120137969839QQihZ002QQcategoryZ26456 QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

http://cgi.ebay.com/ebaymotors/OMC-JOHNSON-EVINRUDE-PROPELLER-V4-STAINLESS-BR-5610_W0QQitemZ120137235907QQihZ002QQcategoryZ26456 QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

http://cgi.ebay.com/ebaymotors/EVENRUDE-JOHNSON-STAINLESS-STEEL-PROPELLER_W0QQitemZ110143489319QQihZ001QQcategoryZ 26456QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

http://cgi.ebay.com/ebaymotors/Propeller-13X19-For-OMC-I-O-Johnson-Evinrude-O-B-Prop_W0QQitemZ300127090472QQihZ020QQcategoryZ26456 QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

http://cgi.ebay.com/ebaymotors/Evinrude-Johnson-OMC-Outboard-Prop-13-X-19-115-140HP_W0QQitemZ140134257218QQihZ004QQcategoryZ2645 6QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

http://cgi.ebay.com/ebaymotors/Stainless-Steel-19-pitch-prop-OMC-Johnson_W0QQitemZ320131257251QQihZ011QQcategoryZ26 456QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

http://cgi.ebay.com/ebaymotors/New-Stainless-Steel-Prop-13-25-x-21-still-in-the-box_W0QQitemZ190128249838QQihZ009QQcategoryZ26456Q QssPageNameZWDVWQQrdZ1QQcmdZViewItem

http://cgi.ebay.com/ebaymotors/OMC-PROPELLOR-12-3-4-X-21P-NICE-USED-FRESH-WATER_W0QQitemZ110144128051QQihZ001QQcategoryZ2645 6QQssPageNameZWDVWQQrdZ1QQcmdZViewItem