I just got a 2000 KDX220. I love to do tight trails, hill climbs ect, like the bike so far has more bottom end then any 2t I've ridden, not much on top it seem but that's ok. My question is on the suspension, rear seems to sag a lot and I hear of people goin to a stiffer spring. How stiff and where should I buy them? remember I don't wanna break the bank... will springs be enough or should I save and look at a whole new suspension? Like to cruise mostly but do like to kick it up at times.