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Half a kilo extra on the front and rust-prone stanchions is not something I'd want to take for the sake of a £55 saving.
More like 300g. Rust prone? Not sure where you get that from. BSO steel forks rust, sure, but RS? Google image search shows nothing but the wildly corroded mag lowers are good craic.
There's a reason that Merlin Reba is cheap - it's stuck in a travel mode that nobody wants. You can change the spring, but by the time you've done that you've spent more money and discovered the damper needs doing too.
http://singletrackworld.com/forum/topic/reba-travel-increased-knocking-at-the-top-of-stroke
It's the reba chassis, crown, damper and spring...with steel uppers.