If you are looking for something more aggressive, but not too aggressive the G5X3 may be a little much. I personally love it in my car. The idle has been raised to the 980 area to keep it going. The only issue I had was my MAP sensor, just can't get right. I have P 106 codes constantly. I don't think it's the cam, so don't worry too much. The lope at idle (sound wise) is awesome. I truly love the car shaking back and forth, personally. Since you have a 6spd you should be fine with the cam and the rear gear, but don't quote me on that, lol. The triangle stamped 243s are a good grab. The springs will definitely have to be upgraded. I think the yellow beehives are rated for .580 lift and the 921 set that I have were rated for .650 lift. If those aren't replaced then you might have a valve kiss the piston. Those lifts are good if the rocker ratio stays the same as well as the pushrod lengths.
I personally loved the service and parts I got from LG Motorsports, so I would highly recommend them. When things didn't pan out on my install and tuning they tried to help the best they could from over 1000 miles away, even though it didn't deal with the part(s) I got from them.
Good guys,
Josh