Can you please suggest macro lens for Nikon D5100?

Hello Guys,

I own a nikon D5100 and currently I only have 18-55mm kit lens. I have seriously saved few bucks and now I want to buy a good macro lens. After a lot of searching over the internet; I have filtered down my choices to 1) Tamron 60mm F2 Macro 2) Tamron 90mm F2.8 Macro

Tamron 60mm is DX lens usable only on APC-S type camera and Tamron 90mm is FX lens. I sincerely do not have any plans to shift to full frame camera in near future. Considering this is it good to go qith Tamrom 60mm over 90mm? Also wouldn't be 60mm good for portrait also?

Please advice.

Thanks in advance,

Mayur