It's certainly possible to get strong without getting big. Not everyone wants to be a bodybuilder.
The key to building strength is low reps (under 8) and fast explosive force and adequate rest between sets. Nevermind the superslow stuff. Plyos are an advanced technique to use once you've built a foundation of strength.
Eddurance is built by higher reps and short rest periods. To do both, train in both rep ranges. You may want to cycle your reps within a workout, within a week or between cycles, say strength one month, endurance the next. Lots of options here.
For an efficient training system, concentrate on the big lifts, Squats, Deadlifts, upper body push and pull.
You body will grow if you caloritic intake is higher than you expenditure. If its a clean, nutritious diet and you train right, the growth will be mostly muscle. if it's junk food and you train inefficiently, it will be mostly fat. If you keep your calories balanced, you will get stronger, leaner and harder.
For more help on this type of training, try posting questions on the EXRX.Net forum. I find they have a lot of expertise in this are there.
You should also check out crossfit.com
Stu