My father wants a chip for christmas so my mother asked me to look for one. she wants to spend around $600 so Im asking yall whats the best chip for around this prices I know people will have different opinion on the matter but I just need the info. I open to all ideas. He would like an adjustable. The truck is an 03 1 ton srw with a 6- speed. He has the afe filter. Also if you know were to get a good price I could use that also I would like to have it here by christmas. Thanks for any info