Hogging out the runners will shift power to the right, but basic blending and smoothing typically yields power accross the whole RPM range.
I'm porting my heads myself and I'm going pretty mild. I plan on putting some time into the doglegs to even out the exhaust flow, but most of my work will be in the chambers. I'm opening up the 2.0 heads to the 2.5 bore and I'm unshrouding the valves. Unshrouding the valves makes a big difference at low lift and typically adds low RPM power. I'm also knife edging the intake dividers and blending the bowls, but mostly it'll just be smoothing.
As far as valves go, I went with stainless .5mm oversized for intake and exhaust. I run E85, so Inconel would be a waste of money for me. If I were running gas and on a budget, I would keep the stock intakes and upgrade the exhaust to stock or .5mm over Inconel. The cams are going to affect your power band much more than mild porting or valve sizing will.