Assuming it is in fact a 4 mech lance and not a 5 mech star than most of your choices aren't bad. That Savage Coyote is relatively cheap with those ranged lasers. However the flaw to the design can be seen in the fact they are all in the right arm so if you arm gets chopped off then the mechs preference will go downhill by more than half it's potentially and make it laughable at range. My original suggestion to go with a J variant is sadly unfounded because of the fact that it is a Wolf, not Coyote configuration.
If pulse lasers are what you are after, then a Rifleman IIC would get them for you. You get mobility out of the jump jets, but you have to remember that you weigh 20 tons less and so won't take the punishment of an 85 ton mech. You still have to cut points (being 8002 BV, argh!). If you want to stay in a Dragonfly then really the only worthwhile option is the Prime. Option number 2, while many, I narrowed down to the Pack Hunter.
The Pack Hunter is cheaper, with only a slightly slower speed. Packing a punch at range, you don't have to worry about flanking your opponent to be effective with it like you would with the Dragonfly. The second perk of taking the Pack Hunter over the Dragon Fly is you can look at large BV to take the place of that Savage Coyote and there is a significant amount of machine that you can qualify for.
My vote, if you aren't looking for Pulse laser spam would be the Kingfisher C. If you want a dedicated range fighter than look at the Warhammer IIC 2. The Warhammer IIC is 2 ER PPCs and 2 LRM-15s with enough sinks to use them. The Kingfisher C on the other hand is sticking it to your opponent because they will have work for their kill since there is no XL engine to help kill it faster and it is an all energy boat. It starts with 2 ER PPCs for range and 4 ER Medium lasers for when it gets close in. And when it gets there it is going to alpha strike nearly every turn and run cool doing it. If you opponent brought plasma weapons, either can just laugh it off.
As for the Pariah and Fenris, no real reason to go over them because they are excellent. I'd recommend the Coyotle, but it is impractical to get that into the group with the other two and not have to put yourself in something as large as an assault mech with included.
