[s-cars] Lap timer suggestions & recomendations

[mlp]

I'm looking for any general (or specific for that matter) list thoughts,
recommendations or experiences and suggestions re: casual use track / lap
timers.

Some of the things I think I'm interested in finding in a timer would be:

-  	Ease of use;

-	Portability;

-	Multiple car, i.e. one, or more transponder(s), if that's the
correct name for them, that could be accessible to more than one vehicle at
the same time if they were running the same receiver;

-	In car splits read out;  

-	Track segments splits;

-	Not cost an arm & a leg.  I'm not necessarily looking for the
cheapest unit.  Would be more biased towards considering bang for the buck,
and possible future expandability, if that's even an option.

-	Finally, reliability/durability.

Any thoughts, experiences or recommendations out there?

Thanks
mike