I know it's not an exact science, but for each of the counties, their number 3 (either current match or most recent match) is as follows:
Derbyshire - Park, typical county pro in his mid 20s, mid 30's career average, low 30's average this season.
Durham - Smith, typical county pro in his mid 20s, low 30's career and seasonal average.
Essex - Westley, 20 year old, mid 20's career average, maybe in a few years he'll progress beyond typical county pro.
Glamorgan - Powell, typical county pro in his early/mid 30s, low 40's career and seasonal average.
Gloucestershire - Marshall (batted 4 behind a nightwatchman), not qualified.
Hampshire - Crawley, nearly 38 and declining.
Kent - Jones, tried and failed, rated very highly in the Corrin household, but not in many other places.
Lancashire - Loye, typical county pro in his mid/late 30s, low 40's career average.
Leicestershire - Dippenaar, not qualified.
Middlesex - Shah, tried and failed, rated very highly in the Shah household, but not in many other places.
Northamptonshire - White, typical county pro in his late 20s, mid 30's career average, high 20's average this season.
Nottinghamshire - Wagh, typical county pro in his early/mid 30s, high 30's career and seasonal average.
Somerset - Langer, not qualified.
Surrey - Ramprakash. Nuff said.
Sussex - Joyce, played international one day cricket before. Mid 40's career and seasonal average. Hadn't realised he was already 30, but still has 3 or 4 years in him potentially.
Warwickshire - Troughton, typical county pro in his early 30s, high 30's career and seasonal average.
Worcestershire - Solanki, typical county pro in his early/mid 30s, high 30's career and high 40's seasonal average.
Yorkshire - McGrath, typical county pro in his early/mid 30s, high 30's career and seasonal average.
So the cupboard isn't bare, but if it were my cupboard I'd be off down the supermarket to get some more provisions in PDQ.