I don't know of a guide, but I can try to help. I got Soldier to 95% and Pathfinder to 93% before I felt like I was going to be unlocking things that were largely "useless" if I went further. Both of these classes are good at what you describe your play style to be. In fact, every(?) class can inflict a moderately effective level of base disruption if played correctly.

As for unlocks/upgrades, the major consideration with whatever class you choose to focus on is when you want to drop the 100k on weapons unlocks. The Soldier's Spinfuser and Eagle Pistol upgrades are both great, as are the PTH's Bolt Launcher and Light AR.

You could break down the "usefulness" of purchases based on if you like hit-scan weapons. Your FOV setting has some relevance here since lower FOV will give you greater accuracy with launched projectiles, while higher FOV will grant you accuracy with hit-scans. The ARs, the Eagle Pistol, and he Shotgun are all hit-scan. The Shotgun is surprisingly good, and I find myself still using it even after shelling out for the Light AR.

I could break down each class and their upgrades for you, if you'd like, but the short of it is that armor and weapons upgrades are great. Perks seem less essential for Soldier than for PTH, whose Reach and Ego perks are pretty much vital for good play. My advice would be to just pick your upgrades based on how you're fairing in matches. Low on energy? Work towards a +energy passive. Bored with chipping away at the upgrades? Save for an unlock. Hope this helped a little.