Kick ass! I, too, have always liked the Nike, and I'm really surprised and pleased to see this upgrade. I just love everything about it, but probably the inside surfaces of the front half the most.
For the beam cannon, maybe you can set it into the hull more; extrude the panel it sits on inwards, then push the turret in. The three turrets on each side of the front hull could also use a little more integration into the ship; I know you want it to look sleek, but they're kinda sticking out. Maybe they could do better as rounded rectangular prisms instead of cylinders.
As for the radar array on top, is the front inset like the back? If so then I think it's fine. For the effect I think I'd prefer something closer to the Faustus solar panels, with a hefty border frame and a fine dark techie mesh in the middle.