In the range of the price/quality, I would chose one that doesn't have a lot of electric parts.
I just found at Orlando PGA Show last week the powerbug (www.powerbug.co.uk) and seems to me very good.
I am in the golf business, that why I have been in the Show, and I will try the distribute it in...
I am planning to developing an academy in the north of Portugal.
I will need a PRO with the PGA card and I will accept curriculum to analize.
Let me know your contact.
Thank you
Alexandre Barroso