I replaced the suntour on mine with a slightly used Tora Air SL fork, I believe it was a 2009 or 2010 stock fork on the Rockhopper SL 29er.
I only spent about $100 on it and I love it for the price I paid.
I'd recommend an air shock if you can swing it, the other one I was looking at when I got mine was a new Tora that was around $220 and a coil fork, the ease of setup on the air and adjustability make it worth getting IMHO.
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