What year ?. 2012 doesn't need much beyond a fork brace. (I did more, but I ride off road as well). It still benefits from $$$, but for road use was O.K. anyway.
Earlier DL's , depending on your weight (the US fork companies have calculators on their web sites), fork brace. (Go with the cheapest, Rick's, it's the best anyway) firmer front springs and pretty much any of the aftermarket rear shocks with correct springing (There's one cheap brand you should avoid, Hagon) . Or find a second hand low k's DL 1000 shock, which is better, and has roughly the right spring for an 80-90kg rider.
If the front is still not good enough, throw Intiminators and 5wt oil in there.
Fork brace ~$80
Front springs ~$200 in Oz, cheaper in the US
Rear spring (only) ~$100 (Not recommended, the damping is inadequate)
Rear shock with correct springs, ~$500 (Ricor) -> $1500 (ouch)
Intiminators ~$200
The rear shock is the problem in terms of costs.
Pete