That `Mech is an uber SRM monster! Friends don't let friends drive uber `Mechs. Besides there's already a Vulture (Mad Dog) B with 4 SRM 6s.
Actually, that's 4 Dual SSRM-6s, for 8 SSRM-6s. And you wonder why it kills you in 2 seconds.

My votes. Inner sphere only, clan tech makes me puke.
IS 85 & 95 tons
85 tons: Battlemaster - It's a fast assault mech with brutal short range weaponry. The others are just more of the same with long range missile and direct fire slug fest written all over them.
95 tons: Naginata - It's a command mech through and through. Lots of LRMs (3xLRM15s) and an ERPPC let it stand off, while the C3 Master Unit would do something awesome with all C3 mechs in the area. For instance, maybe any C3 equipped mech currently locked onto an enemy mech would give the Naginata missile tone, all the Naginata needs to do is select the friendly mech he wishes to use as a targeter and that seals the deal for targeting info.
IS 60 tons
60 Tons: Rifleman - It's a dedicated AA battlemech with speed equivalent to a Warhammer but 30% less armor. The combination of Ultra AC5s and ER Large Lasers makes it deadly against aircraft, battlearmor, and enemy light mechs. Also, the arms stick out relatively high giving it good clearance over obstacles, letting it fight hull down easier on maps like Sandblasted where the rolling dunes can ruin a shot fired from something at hip height.
IS 40 tons
40 Tons: Assassin - Incredibly fast and with a long jump range, the Assassin dictates at what range battle will take place. It's armament is wide and varied with an LRM-5, SRM-2, and Medium Laser. Though other variants have it equipped with a Light PPC and twin SRM-2 racks which would make it a terrific hit and run sniper to counter the SCat and Hollander.
IS 20
20 Tons: Locust - Fast, and incredibly cool looking. Give it an XL engine, MASC, 2 MGs, 2 Small Lasers and a Medium Pulse Laser and you are in business.