Hi ajthomas75,
I find that the SMS and MCG fit all my needs. The sms might be a bit too large for most 1/24 applications, (but ok for some), but are just right for 1/12 cars and bikes. You get different head types, phillips, slotted, rivets. The mcg are perfect for 1/24 and 1/43 and even certain 1/12 applications, also with different head types. I also have the SRC sets but have yet to use them, looks good though. Those come in scales from 1/43 to 1/12. All 3 of these go a long way as each "sheet" has +500 pieces.