Check out Allan Holdsworth, his music have inspired plenty of bands in the tech metal section like Cynic, Martyr, Aghora and so forth.
Santiago from Aghora wrote abit some arpeggio stuff :
http://dsrmusic.com/metaltab/text/gu...sdoblesL1.html
But get Allan Holdsworth instructional video, it recomends 10 scales :
C major
5/2
Gtr I
|-1---3---5---7-8---10--12-13----15----17----19-20--|
|-1---3---5-6---8---10--12-13----15----17-18----20--|
|---2---4-5---7---9-10--12----14----16-17----19-----|
|---2-3---5---7---9-10--12----14-15----17----19-----|
|---2-3---5---7-8---10--12----14-15----17----19-20--|
|-1---3---5---7-8---10--12-13----15----17----19-20--|
D minor + 7 (D Melodic)
Gtr I
|-1---3---5---7---9-10----12-13----15----17----19----|
|---2-3---5-6---8---10----12----14-15----17-18----20-|
|---2---4---6-7---9-10----12----14----16----18-19----|
|---2-3---5---7---9----11-12----14-15----17----19----|
|---2---4-5---7-8---10----12----14----16-17----19-20-|
|-1---3---5---7---9-10----12-13----15----17----19----|
A minor+7-6(A Harmonic)
|-1-----4-5---7-8---10----12-13-------16-17----19-20-|
|-1---3---5-6-----9-10----12-13----15----17-18-------|
|-1-2---4-5---7---9-10-------13-14----16-17----19----|
|---2-3-----6-7---9-10----12----14-15-------18-19----|
|---2-3---5---7-8------11-12----14-15----17----19-20-|
|-1-----4-5---7-8---10----12-13-------16-17----19-20-|
A minor +7 +4
|---2---4-5---7-8------11-12----14----16-17----19-20-|
|-1-----4-5---7---9-10----12-13-------16-17----19----|
|-1-2---4-5-----8-9----11----13-14----16-17-------20-|
|-1-2---4---6-7---9-10-------13-14----16----18-19----|
|---2-3-----6-7---9----11-12----14-15-------18-19----|
|---2---4-5---7-8------11-12----14----16-17----19-20-|
A flat diminished
|-1---3-4---6-7---9-10----12-13----15-16----18-19----|
|---2-3---5-6---8-9----11-12----14-15----17-18----20-|
|-1---3-4---6-7---9-10----12-13----15-16----18-19----|
|---2-3---5-6---8-9----11-12----14-15----17-18----20-|
|-1-2---4-5---7-8---10-11----13-14----16-17----19-20-|
|-1---3-4---6-7---9-10----12-13----15-16----18-19----|
6
|-1-2-3---5-6---8---10-11----13-14-15----17-18----20-|
|-1---3-4---6-7-8---10-11----13----15-16----18-19-20-|
|---2-3---5---7-8---10-11-12----14-15----17----19-20-|
|-1---3-4-5---7-8---10----12-13----15-16-17----19-20-|
|-1---3---5-6---8-9-10----12-13----15----17-18----20-|
|-1-2-3---5-6---8---10-11----13-14-15----17-18----20-|
7
|-1---3---5-6-7-8---10----12-13----15----17-18-19-20-|
|-1---3---5-6---8---10-11-12-13----15----17-18----20-|
|---2-3-4-5---7---9-10----12----14-15-16-17----19----|
|---2-3---5---7-8-9-10----12----14-15----17----19-20-|
|-1-2-3---5---7-8---10----12-13-14-15----17----19-20-|
|-1---3---5-6-7-8---10----12-13----15----17-18-19-20-|
8
|---2---4-5-6-7---9-10----12----14----16-17-18-19----|
|---2-3---5---7---9-10-11-12----14-15----17----19----|
|-1-2-3-4---6-7---9----11----13-14-15-16----18-19----|
|---2---4---6-7-8-9----11-12----14----16----18-19-20-|
|-1-2---4-5---7---9----11-12-13-14----16-17----19----|
|---2---4-5-6-7---9-10----12----14----16-17-18-19----|
9
|-1-2---4-5---7-8---10----12-13-14----16-17----19-20-|
|-1---3---5-6-7---9-10----12-13----15----17-18-19----|
|-1-2---4-5---7---9-10-11----13-14----16-17----19----|
|---2-3-4---6-7---9-10----12----14-15-16----18-19----|
|---2-3---5---7-8-9----11-12----14-15----17----19-20-|
|-1-2---4-5---7-8---10----12-13-14----16-17----19-20-|
10
|---2-3-4---6-7-8---10-11-12----14-15-16----18-19-20-|
|-1---3-4-5---7-8-9----11-12-13----15-16-17----19-20-|
|-1---3-4-5---7-8-9----11-12-13----15-16-17----19-20-|
|-1-2---4-5-6---8-9-10----12-13-14----16-17-18----20-|
|-1-2-3---5-6-7---9-10-11----13-14-15----17-18-19----|
|---2-3-4---6-7-8---10-11-12----14-15-16----18-19-20-|
Thats the 10 most usable scales in all positions. But get his video, you will learn more from it.