The terrain is going to have a lot of woods, rivers as ND hills, does that change as my of the suggestions?
You need jumpers to get over woods and rivers while still inflicting high movement modifiers on your opponents. Even the fastest runners will be at a disadvantage.
And you need some weapons with negative targeting modifiers (pulse lasers, TCs, LB-X cluster) to offset your jumping movement modifier and woods terrain targeting modifiers. With 3 gunnery all around, players will rarely connect otherwise. Some earlier strategies relying on potshots at extreme range with unmodified ER large lasers don't work well in this terrain.
And again, these considerations come on top of the usual Grand Melee dictums about mobility (more is better) and survivability (high armor, low ammo, SFE if possible).
Limiting to jumpers removes some options from my earlier list. Here's how I'd rank the remaining ones and a few new ones:
Vapor Eagle, BV2=2368, Move=6/9/6, XLE+ammo, PLL & PMLx3 + TC
Timber Wolf S, BV2=2462, Move=5/8/5, XLE+ammo, PLL & PMLx2
Guillotine IIC, BV2=2377, Move=4/6/4, SFE+ammo, PLLx2
Rifleman IIC, BV2=2307, Move=3/5/3, SFE+no ammo, PLLx4
Stooping Hawk C, BV2=2435, Move=5/8/5, SFE+centerline+no ammo, ERLLx2 & ERMLx2 + TC
Summoner A, BV2=2145, Move=5/8/5, XLE+ammo, PLL
Nova S, BV2=2061, Move=5/8/5, XLE+ammo, PMLx6
Summoner Prime, BV2=2298, Move=5/8/5, XLE+ammo, LB-X
Coyotl A, BV2=1753, Move=7/11/7, XLE+ammo, PLL & PSL
Viper Prime, BV2=1450, Move=8/12/8, XLE+ammo, PMLx2
Pouncer D, BV2=2246, Move=6/9/6, XLE+ammo, ERMLx6+TC
Mongrel C, BV2=1465, Move=7/11/7, XLE+ammo, LB 10-X
Kit Fox S, BV2=1342, Move=6/9/6, XLE+ammo, PLL & PML & PSL
IMO, the Vapor Eagle continues to be the best choice. It's the only option that completely offsets its jumping modifiers with a targeting computer and pulse lasers (at both long- and mid-range). Nothing else has that -3 combined targeting modifier. Yes, it's munchy, but if you want to go far in the melee, it's the surest bet. Just remember to dump the ammo before it becomes exposed.
If you don't want to be "that guy" with the munch machine, I'd run the T-Wolf S. A little slower and less accurate, but the heavier armor helps make up for it. Again, don't forget to dump the ammo before it becomes exposed. But the massed SRM racks may come in handy if you step into a furball before then.
Hope this helps.
[Edits: Moved the Nova S and Stooping Hawk C up above the Summoners. Added Guillotine IIC]