My favourite loadout for a SHF is the Spatial with this:
2 Phoenixes codenamed weapons
1firestalker missile
1 sindewinder missile
1Nova
the rest of weapons are Imp Debilitators with the same speeed as the phoenixes or it will ruin the aiming cross.
1 Ripper Mine
1 Nuclear Mine
I would not go with 2x sidewinder missiles because you'd have low missile Ammo. What i do usually is 1x firestalker & 1 sidewinder.
I like to use a Spatial a lot, the equipment i usually use is:
2x 650m/s debilitator guns
2x 650m/s PHEONIX'es
1x firestalker
1x sidewinder
3x 650m/s debilitator turrets (only 2 of them fire fowards tho)
1x Nova Torpedo
1x Nuclear Mine
1x Ripper Mine
Signature Move: "Suicide Bombing" - Jouste against foe, launch nova torpedo, launch missiles, drop mines, rape the f button and hope you don't die in the explosion! AHAHAHAH
EDIT: Shalo beat me to it
EDIT2: I do think SHF are a bit underrated. they can be hard to use/fight with cause they're big and SNAC magnet, but if you practice a lot with a SHF you'll n otice the best flight tactics for a SHF are way different from your normal fighter, and if well use, it can be very dangerous especially if you do the suicide bombing move and destroy everything around! muhahaha