!20 Gig (predominatley Sandforce 22xx controller.
Any of these between 100->130 would be about the same. the ONly one less than 100 would be the ADATA
http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=100008120%20600038519%20600038484&IsNodeId=1&name=120GB
http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=100008120%20600038519%20600038478&IsNodeId=1&name=128GB
Of these My choice is (About the most poulare and has very low neg reviews)
http://www.newegg.com/Product/Product.aspx?Item=20-148-442
Note the price is about the same for 120 gig and 128 gig. 120 gig slightly cheaper, but also slight smaller.
In the 128 Gig catagory (which is my prefernance)
SD Extreme is OK
http://www.newegg.com/Product/Product.aspx?Item=N82E16820171567
Cost wise no lower than 128 gig m4, SD has kind of low 4K random reads (This is one of the more important parameres for a Boot OS drive.)