I would learn to disassemble/reassemble all the components that contain bearings. Buy the tools necessary to do the job. If you eat up the hubs/bb/headset from lack of grease/proper adjustment the cost will be higher to replace than to get the tools and learn. I use high-temp. automotive bearing grease, you get a lot for the $. New brake pads, you have to have decent stopping power. Change all the cables, a broken cable is very little fun and changing them is an inexpensive insurance policy. Get some cork bar tape(non-adhesive), watch a couple of youtube vids. and learn to do your own bar tape replacement. I would leave all the cosmetic wants until the basics are taken care of.