Got one. It's all introductory tech, so I aimed for a boosted BV of 6100 to compensate. Looking at the stuff in Record Sheets 3039, here's what I've come up with:
Cataphract CTF-1X: This is your generic heavy bruiser. Couple big guns with good range and a set of lasers for close-in work, some of them covering the rear. Decently tough and with a good amount of heat sinks, this should last for a quite a while unless several enemies focus heavy fire on it at once. Speed is average for a heavy mech, though this is the only unit in your force that does not jump.
Victor VTR-9A1: The biggest guy in the unit, but despite that not quite as tough as the Cataphract. That's because it moves faster than average for an assault mech, jumps, and mounts very heavy close-range firepower, most of it in the form of an AC/20, which you can think of as Battletech's equivalent to a Warthog's main gun, and all the fun thereof. Also one of your only mechs to mount dedicated anti-infantry guns. Infantry see regular use in our games, mostly my fault, so it helps to be prepared.
Grasshopper GHR-5H: What the Victor does with that cannon, the Grasshopper does with lasers. Lots of them, with the heat sinks to play all you want. This is also the toughest mech in your force, both because of the armor and because it carries very little explosive ammo, with what little it does carry hard to crit because it's surrounded by heat sinks, with statistics being your friend here. It's also just as fast and maneuverable as the Victor. Nobody likes fighting a Grasshopper, because it takes forever to kill and is putting out solid damage the whole time.
Catapult CPLT-C1 Jenny: A unique variant, but so perfectly suited to this force I had to give it to you. Basically take the Victor, drop fifteen tons, and replace the big gun with short-range Macross Missile Spam. Victor opens the holes, Jenny fills 'em with crits. You get the idea. :)
Raven RVN-4X: The only light unit in a force otherwise heavy or assault weight, and also the only one to move faster than 4/6. It also jumps even farther than the other mechs, so I imagine this will be used as a flanker or backstabber. Solid firepower, and brings the rest of your anti-infantry guns. Tough for a light, but we're still talking about something half the size of almost everything else in the group. It's not tough, it just has a margin of error when it comes to its goal of not getting shot ever. Think of it as a little pixie with a big knife. When everyone else is distracted by your big guys, this sneaks around and shanks things in the kidneys.
Overall, very much a brawling force. Not much in the way of long-range firepower, but you've got the maneuverability to make the most of cover and avoid taking hits until you get close. Also, because most of your mechs are pretty big, if you can get enemies into pointblank range with multiple mechs, you'll likely be dishing out more melee damage than they will. Total BV of 6107, I'll print out sheets and bring them for you.
I recommend that at some point you try and pick up
Record Sheets 3039 and
Record Sheets 3050 Inner Sphere. These are pdf products, and will give you literally hundreds of record sheets, focusing on the mechs that can be found in the Lance Packs, among others.