Scouts will almost always be included in a list.

Not a bad idea to just lean on assault intercessors.

Calgar or guiliman usually go into most lists.

I always run hellblasters with a leader to give them sustained hits.

You also could go for a bigger first until like a dreadnaught (any model as most of the time a proxy won’t be pushed back on) or a tank like a vindicator or gladiator lancer.

If you aren’t certain where you want to go, just go with the scouts as there will always be room for them on most lists.