Rigid forks on MTB

I'm building up a bike to ride some cycloX in the winter. Picked up a Giant Avalanche ally frame for a fiver off ebay, now need some forks.It used to have sus forks but I will fit rigid.
Have seen some Kona P2 forks on ebay for next to nowt, would these be any good or too short, been readin stuff about suspension corrected forks, and I need about 430mm fork blades??
Anything else I need to know? Please help a roadie
Have seen some Kona P2 forks on ebay for next to nowt, would these be any good or too short, been readin stuff about suspension corrected forks, and I need about 430mm fork blades??
Anything else I need to know? Please help a roadie

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Yeah, plus Planet X showroom is in Sheff, just like me. They are my new option, but was looking for s/h cheapies.
Handsome Dog were doing some a while back for £30. Don't know what they're like, but for £30.. It's a shame there aren't more budget rigid forks out there.
14 Kona Unit
Kona Kula SS
Trailstar SS
94 Univega Alpina 5.3
Try Carbon cycles forks, if on a budget I think they do a alloy version for cheaper? else fro lighter weight and possibly more damping go for the carbon ones, they are very nice for the money.
http://www.carboncycles.cc/?s=0&t=2&
re weight: the lightest (triple butted) are apparently 795g, however I bought some and they were 200g more, even though the packaging stated 795g (Paligap said they would amend this).
Salso Cromoto or something from Tange, or Surly.
Looked at the carboncycles ones, in ally, very nice, £63 delivered.
On-one are 40 for the fork then another 15 for the canti bosses, which I want, plus they arent as long as the carboncycles ones.
Ebay is first choice, bidding for some long version P2's at the minute. If that gets too near £50 I will buy the carboncycles. In fact the carbon version of these is not too much more than the ally version....mmmmm