As for recommendations I suggest the Jawbone as referenced on this forum countless times as one of the best (I have one and love it). The Plantronics D640 is also good. If it must be Motorola I don't know of a particularly great one but if you are looking for cheap, I see Motorolas pop up on this deal site a lot: GotApex? Deals & Coupon Codes
. This site then often links to deals on Meritline here
and as of my pasting this link, I see a Motorola at the top for $17.99 (one this cheap - almost always refurbished).
Long response just letting you know my methodology for finding something. Hope it helps.