Can someone please provide the weights of the front and rear WELD wheels and the same for the newer wheels? I'm trying to decide if their worth the cost of upgrading. Thanks.

You can probably get the exact answer from a CSR. But if I remember correctly, the Weld wheels and the new wheels are the same weight. A major advantage of the newer wheels is that it is easier to do alignments, since the rims of the Weld wheels often don't stay true.