Alpha Master Chrony...can be found on sale for $99...maybe a bit less.
Does everything you need it to do, with the benefit of the remote. A remote is a MUST. If the chrono errors on a shot, you can just turn it off/on to reset. If you have the non-remote kind, you have to wait till the line goes cold - thus wasting time. Also, the computer part is in the remote, so if you shoot the chrono, you're only destroying the sensors or possibly the skyscreens - not the computer which is the bulk of the $$$.
The Beta and Gamma just add permanent memory so that you can recall the shot strings later on. I don't like this method, which is why I got the Alpha and saved money. The Alpha has memory for 32 shots until it is turned off. I prefer to have a small note pad and pen and write down the results of the string after the string has been shot.
There are models with printers and such..but I like writing down on paper the caliber, bullet, load..then the string velocities. The ones with lots of memory, I can't remember which string was which load - so I have zero use for going back to the chrono at home and reviewing strings on it, not to mention, the navigation using 1 button only and doing string deletion, shot deletion, recall and all that is a hassle. I like the simple Alpha.
I wanted chronographing...simple string memory, and remote. For that, the Alpha Master is hard to beat price-wise.
The money saved on the chrono will buy you a pretty good $22 tripod at Wal*Mart so you can set it up nicely.