Updated your combos list, then:
Limited combos:
Stamina: (Earth/Burn) (Virgo/Kronos/Pegasus II) AD145WD / B:D / 230D / 85WD
Defense: MF-H Earth (Virgo/Kronos/Kerbecs/Pegasus II) GB145CS
Attack:
MF-H Ray Kerbecs (GB145/AD145/T125/D125) CS
MF-H Spiral Ionis 85 (CS/F)
MF-H Beat (Ionis/Lynx) 85 CS
Balance:
{MF-L} Burn (Virgo/Kronos) 85F
{MF-H} Earth (Virgo/Kronos/Pegasus II) 230CS
Standard combos:
Stamina: (Phantom/Scythe) (Virgo/Kronos/Pegasus II) AD145WD / B:D / 230D / 85WD
Defense: MF-H Scythe (Virgo/Kronos/Kerbecs/Pegasus II) BD145CS
Attack: MF-H Hades Kerbecs (GB145/AD145/T125/D125) CS
Balance:
{MF-H} Phantom (Virgo/Kronos/Pegasus II) BD145EDS
{MF-H} Phantom (Virgo/Kronos/Pegasus II) BD145CS
MF-H Gravity Perseus (Stamina) BD145EDS
{MF-L} Phantom (Virgo/Kronos/Pegasus II) 85F
{MF-H} Phantom (Virgo/Kronos/Pegasus II) 230CS
I assume that the Track you are referring to as "80" is actually 85, because an 80-height track doesn't exist.
The main things that your brother's collection adds are 230, 85, D, F, Pegasis II, Spiral, and Beat. 230 and 85 let you make super-tall and super-short Stamina combos, and allows you to make 230CS and 85F Balance combos. 230CS is a setup that gives good Defense without sacrificing much Stamina. 85F is a Tornado Staller setup, which is essentially a Stamina type that wins by circling around its opponent until its opponent runs out of stamina. Pegasis II can be a very good Clear Wheel, though it does stick out somewhat more than Virgo or Kronos, so it's not as good on low-track setups that leave it exposed. Spiral and Hasbro's Beat are both good Attack wheels for Limited, and Beat may be top-tier, though there isn't enough testing out there to confirm it yet. You still definitely need more rubber tips, though. That will make your Defense and Attack a lot stronger.