Tank Guy -
Forged Iron
Forged Steel
Steelforge
Ironforge
Hammered Iron
Hammered Steel
Blaster Guy -
Worse than Wrong (with appologies to Feynman)
Mister Higgs
Entangled Quantum
Tachyon Torch
Proton Proton
Hydrogen Dawn
Supersymetry
Shield takes a more dedicated effort to get there than SR though.
EA can sofrcap easy except dark and psi (and toxic)
Brute SR is the best version really. The AOE toggle comes at 20. So you can exemplar well. And with scaling resists S/L can climb to 90 easily with most builds instead of 75 like on a Scrapper.
On Tankers SR numbers are mostly overkill.
Keep in mind there are a lot of people who think this game is too easy. So they also would like a more involved playstyle featuring less steamrolls, more need for CC and support.
They just tend to get bored and take breaks.
Stalker has a low threat rating too, so in a team environment you can shed some aggro easy off onto scrappers Brutes and Tankers.
Meanwhile a lot of Stalker sets are fairly aturdy..