These kinds of questions I often chuckle at... how can someone on the other side of the world tell you what your next piece of camera equipment should be?
My first thought that pops in is... if you don't know at least generally what you want, you are not ready to purchase anything.
How difficult are the concepts of:
- what is your budget?
- I want to shoot bugs and flowers up close = macro lens (50-150mm)
- I shoot in smaller areas or landscapes a lot = wide angle (10-50mm)
- I shoot indoors in low or poor quality light = fast lens from (10-50mm but apertures from F/1.8 to F/1.4)
- I want to shoot portraits = long fast lens (50-200 mm F/2.8 or primes in the 70 to 105mm range)
- I want one general walk-around lens that does everything ok, but nothing fantastic = 18-200 style (more styles are coming out everyday)
- I want to shoot weddings = all of the above and more (lol)
As far as battery grips, I'm on my 2nd camera with one, and love it. I cannot see myself using a camera without one, and though they add weight (in cases like mine, a lot of weight to an already heavy camera... lol), I love what it does. The weight makes the camera more stable, the size increase makes the camera easier to hold and control in my hand and the 2nd battery extends the times that I can shoot before I need to change batteries.