Don't know where you are, and it makes a difference. A budget would probably mean no leather, but textile or mesh? How hot does it get where you are and for how long?
You might want to start out at newenough.com, there's plenty to study up on and some reviews of the gear.
+1 where you live means a lot on what you are going to want type of gear you will need. I vote Textile jacket with lots of vents. FieldSheer Adventure jacket works for me. Also the Fieldsheer Mercury over-pants are pretty nice, but not very well vented for the hot days.