wheel/tire weight question

I have an 05 xe 4 cylinder and a few years ago i bought some 17" le wheels and tires for a great deal on here. It is now time to replace the tires. I have a 3" spacer lift in fron and 2" block in the back. I want to go up a size and buy a more aggressive at tire. Im wondering if i should buy 15 or 16 inch wheels and 32" or 33" tires or keep the le wheels and get that size tire. I want to keep the weight down because the 2.5 is not that powerful. Any suggestions on a nice light 17" tire or should i go lighter with a smaller wheel.