Eh, the biggest thing when it comes to early Hardmode summon is the two easily-available minions you have are either Spiders (who are great on backdrop but suck against air) and Pirates (slightly better damage but pure melee and can't really do much against air). The Beholders I'm guessing are similar to Imps and Hornets with the ranged projectile stick, so in general those tend to work better than ground-stuck ones sans a few bits.
Funny part is, usually once I beat The Twins and get an Optic Staff I'm pretty much set until Plantera and Golem, where I have to seek out either Deadly Spheres or Ravens, maybe the Xeno Staff if feeling especially risky. The biggest hurdle of course is just GETTING to that point because all the applicable minions prior are either early-game or landlocked to a degree.