I think it looks good.

 

fast way to get rid if any wheel gap

 

Buy bigger wheels?
Haha

 

Wheel gap will decrease but the ground clearance will increase giving you an alternate 4x4 look.

- Speedo and odometer will also read noticeably lower.
- Unsprung weight increases reducing acceleration. It can also negatively affect handling and ride comfort since the suspension is faced with heavier wheels/tires.

 

If I am not changing the overall diameter of the tire, it won't increase ground clearance.

 

True, however, you'll need to go down to 25 series tires at the rear increasing harshness and price of the tire due to limited selection.

255/35/18 (635.7mm) ~= 265/30/19 (641.6mm) = 265/25/20 (640.5mm)

 

This is the main concern I have at this point. That low of a profile tire and the roads here.

 

So, I think I am going to get 20" Niche Targas, with a little bit bigger tires, then drop it back down to stock height...

 

doesn't look too bad in pics, but it looks like the car is riding a few inches higher than stock.
all personal preference. imho, aftermarket wheels need a suspension alteration

 

20" on stock suspension, reminds me of a going to a barber to get a number 20(doesn't actually exist) all around, no cleaning the little hair either..... Ta da!