digitalwolf, did you mention how much you weigh?
Everyone's different mate, but the weights you're handling suggest to me that you're not too heavy?
And as mentioned if its strength increase you want, drop your reps by half at least. From doing 10-20 reps for god knows how long, you've probably built up enough endurance in your muscles to be really go for higher weight and lower reps. Try pyramidding with bicep curls to see how you handle it, ie; 1 x 10, 1 x 8, 1 x 6, 1 x 4. If its works good, then drop off the 1st set, so you only do 3 lower repped sets.
I'd also advice doing bicep curls 21's. For me, and plenty others in my gym, although they're higher reps they don't half build strength.
21's = 7 reps 1st half of the movememt, (from bottom to paralell), 7 reps top half (from parallel to top), 7 reps full range. KILLERS!
Anyone heard of Owen Neil? He taught me that!
Aside from that i'd think about just doing some basic and compound lifting.
Squats, deadlift, bench press (forget incline/decline for the timebeing), shoulder press, pullups, biceps curl, dips, french press (skull crushers).
Just my 2 penneth. We're all different so think about it and maybe experiment. You'll get loads of advice, a lot will differ, but none of it may be wrong, you just need to find what works for you. Good luck