Dwarfs get three star players. Grim Ironjaw, Zara the Slayer, and Morg N' Thorg
Grim Ironjaw is a ST4 troll slayer. He comes with multiple block which is of questionable use as it doesn't combine with frenzy. The higher strength isn't worth as much when a regular troll slayer already has dauntless. Probably not worth an inducement at 210k.
Zara the Slayer is available and while she costs 270k she will do everything Grim Ironjaw does and do it better. at MV6 she's actually one of the most mobile players available on a dwarven team and her skills make her an excellent addition to a dwarf team.
Morg N' Thorg. A starting dwarf team with little or no Guard skills might have use for a ST6 player but realistically Dauntless on your troll slayers will see you through most scraps. Get Zara and use the change for something else. A wizard perhaps, or some beer.
The Pro Elfs get three star players. Eldril Sidewinder, Jordell Freshbreeze, and Morg N' Thorg.
Eldril Sidewinder works just like your catchers. A starting Elf team is usually short on positional players and Eldril has all the skills needed to work as a receiver deep in the opposing team's half. His hypnotic gaze will also open up routes in the opposition defence where your elfs might otherwise be hard pressed to break through. A very good choice at a relatively cheap cost.
Jordell Freshbreeze is one of the best players in the game. He's a cross between a pro elf blitzer and a wood elf wardancer, and he comes with AG5. For 260K you get an 8357 player with block, dodge, leap, sidestep and diving catch. He'll do anything your blitzers will do and do it better. He can also leap into cages to hit the ball carrier. With AG5 leap is a 2+ roll but Jordell is still a Loner so team rerolls can't be relied on. If you can afford either Jordell or Eldril I would take Jordell. The 60k difference in inducements would buy a bloodweiser babe but Jordell is a player that will win games for you.
Morg N' Thorg is a good choice. But he costs a lot more. Use him against bashy sides, against agile sides Jordell is a better choice.
The gobbos get three players. Ripper, Scrappa Sorehead, and Morg
Ripper is a non-stupid troll. With ST6 and grab he's not amazing but a goblin team with Ripper can put three trolls on the LOS. This will help you take out opposing players and it will save your poor gobbos from getting hit, and unlike your secret weapons he'll stay for the entire game. At 270K Ripper is almost a steal for what he offers the team. Hire him. Even if it means you can't afford any bribes.
Scrappa Sorehead is a pogoer. He comes with Right Stuff which lets him get tossed by your trolls, unlike a regular pogoer and he's got both sprint and sure feet. You might think tossing a pogoer sounds like a great idea but Scrappa has no skills to help him handle the ball and as a loner with average agility you can't trust team rerolls to help you. Scrappa isn't worth 150k. If you have that much left after hiring Ripper I suggest using it on bribes and babes.
Morg N' Thorg. Ripper is good enough nine times out of ten.
Halflings get three players. Deeproot Strongbranch, Zara the Slayer, and Morg.
Deeproot Strongbranch is the only ST7 player in the game. He also comes with block, strong arm for tossing halflings, and he doesn't take root like a regular treeman. Halflings suck. If you have the inducements you have to take Deeproot. No ifs and buts. Ideally this will give you three treemen to put on the LOS. It's the best 300k you'll ever spend. And it might even give you a slight chance of not losing.
Zara the Slayer would be an amazing player on a halfling team. If you can afford her. She has mobility unlike Deeproot but I'd still pick Deeproot over her. And if you have money lefter after hiring Deeproot you want to get a Halfling master chef. And if you have 270k left after that, well, get Zara. You'll need all the help you can get.
Morg N' Thorg. Too expensive for what he brings to the team. Halflings need Deeproot and a Chef. If you have 430k left after that for Morg then by all means, get him.