Newer
Demarini White Steel or Raw Steel (they are coming out with a new one in 2016) - both are singlewall, White steel has composite handle, raw steel has metal handle
Easton made a two piece singlewall, the L7.0 (also the older version was a 2012 Salvo Scandium SP12SVC) both have composite handle, singlewall barrel
Easton Salvo Scandium SP15SVS (older version were the L9.0 & 2012 Salvo Scandium SP12SVS) one piece singlewall
After that you got Anderson Flex, Demarini Ultimate Weapon, Worth Legit Singlewall
Older
Anderson Nanoteks - OG Nanotek was a one-piece, 2012 Nanotek Alpha two piece composite handle balanced, 2012 Nanotek Omega two piece composite handle endloaded
Anderson Pyrotechs (pre 2011) and Flextechs (pre 2002)
Rip-It REAP5
after that you got real old school - TPS Ritch's Superior/Powerdomes, Worth Carl Rose/Lighthouse/Supercells/Easton Redline C-Cores (if they allow them)
Personally I am a big fan of the OG Nanotek, however, White/Raw Steels are pretty much the weapon of choice for those singlewall leagues that allow composite handles. On the downside the White/Raw Steels are not known for their durability.