I have a Rans Stratus, but recently bought a Optima "Orca" high racer recumbent, which has a more reclined hard shell seat. At this point it seems like holding my head up is a lot of work. I'm wondering (a) if I should buy a headrest, or wait a while and see if I get used to the more reclined position, and (b) if I should buy a headrest, what kind should I buy? I'm looking at the Optima, Challenge, and ICE headrests.