Best preemergent for my lawn?

 I'm still learning so if you can offer any advice, I'd appreciate it.

I have a lawn care chemical company that takes care of my sodded
areas, but he said it would be too expensive for me to use his service
for the rest of my sparcely grassed yard.  He just sprays fertilizer
or pre-emergent or what ever is needed every 4 - 6 weeks.  Anyone got
a recommendation for what I can buy for the other 1/2 acre I'd like to
limit weed growth this year.

Also, is there a program I might follow throughout the year.

I live in Atlanta, GA.

Thanks,

 
Dimension may be a consideration for your pre-e concerns. You're quite a
bit south of me tho so take it fwiw.

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but you like working on the south central regions of men, moparhoLICK

 
There's an old addage that goes something like this: Any spot of dirt
will grow something - it will either be something you want or
something you don't want.

The moral being quit fighting what you don't want and plant what you
want.  Quit spending money on herbicides and plant grass!

Red

 Hey Red,

Did it ever occur to you that I have planted grass?  Aerated and
seeded last fall.  This yard has been a work in progress for 2 years
and it's been aerated and seeded yearly.  Now I'd like to prevent
weeds from coming in.

Thanks so much for your helpful comments.

*asshole!*