I am with Richard there, I would go for a similar approach.
Proposing stats for the Tauros Venator:
Type: AV, Save 6+, Move 25cm, FF6+, CC6+
Twin-Linked Lascannon AT4+, 45cm Range
OR
Twin Flak Autocannon 30cm AP4+/AT5+/AA5+ (That is the Sabre Plattform-gun)
Notes: Scout
The Flak Option may come with a higher price tag. They are a bit better in every aspect than sentinels.
Formation:
4 Tauros Venator (Las) at 150 Pts. May buy 4 Valkyrie Skytalons at 150 Pts
Valkyrie Skytalon
AV 35cm Arm 5+ FF 6+ CC 6+
Heavy Bolter 30cm AP5+
2x Rocket Pods 30cm 1BP, Disrupt, One-Shot
Notes: Scout, Skimmer, Transport. May transport two Sentinels (of any kind) or a Tauros Venator
Vulture Punisher
AV 35cm Arm 5+ FF 4+ CC 6+
Heavy Bolter 30cm AP5+
2x Punisher Gatlings 45cm 2x AP3+/AT5+
Formation: Regular Vulture Formation, swap at 0 pts, any combination possible.
Modification to existing formation: Sentinels gain the option to add Sky Talons instead of regular Valkyries. Add two Talons for 75 pts, making the "moving meltas" much more appealing than ground slogging
Modification to existing formation: Thunderbolts may be expanded to a formation of up to four, paying 75 per extra Thunderbolt. Likewise with Lightnings.
The two "new" mentioned formations would go into SUPPORT of course.
edit: A small note on the Punisher. THey are actually still comparable to a warhound with double Vulcan Mega Bolter - but without Reinforced 5+, without Void Shields and without beeing a WE. On the other hand they are scouts. So I guess that kinda works out? Perhaps increase the AT Value to 4+? Or reduce the shots from 4 to 3 and add Disrupt? I would still take the 120cm version at the moment, to be honest. Even though the Punisher has much more style...
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