My death-from-the-shadows suit:
Advanced Gallente
Basic shield extenders
Two basic dampeners
Reactive plate
Shotgun
Sidearm of your choice, though you probably won't have the chance to use it
Basic grenades
Basic remote explosives

Perfect for maps that have nodes within a building or ones that have cover within 50 meters of the node. Place your REs near the node (remember to space them apart!!!) and find a safe place where you can watch for approaching enemies. Let them reach their objective (preferably facing away from your location) and then sprint after them. Shotgun to the back of the head fells most anyone in one or two shots. Multiple enemies/tanked heavies can be taken out with the RE.

I begin each battle with this suit, but with an uplink in place of the REs. If I'm lucky enough to have a supply depot nearby, I'll then switch to the same suit but with a compact nanohive (mainly for emergency healing...if you survive long enough) and drop it somewhere nearby, before finally setting my REs.

Obviously, this suit is very low in EHP (250 or so) but is relatively cheap (under 20k, I believe.) The whole point is funneling the enemy to where you want them to go--if there's a CRU nearby, place two REs on the sides farthest away from you and save the last one either for the node or behind a wall that you can lure an enemy towards if you're spotted. You then need to have the patience to lie in wait and spring your trap. A typical match (assuming you're protecting the node closest to your MCC) may only result in 5 or 6 kills...but oftentimes you'll be the only one standing between the enemy and an unchallenged hack.

And for the love of God, if there's a blaster turret nearby, be sure to keep it alive! A turret springing to life is a great way of letting you know that the fun is about to start:)