Logistic
TAC HQ - in S-70 for fast transport.
Man Kat1 - fast with large supply.
CH-47C - fast with large supply.

Infantry
SAS - Who Dares Wins. I run two cards because I do not run dedicated MANPADS. The more expensive AH.7s have very good rockets and I prefer them for my opening.
Gurkhas '90 - 2 cards because they are very versatile shock inf. They have a Minimi and SMG for anti-inf and a very good LAW-80 for tanks. Partner them with SAS. Same speed as SF.
Diggers '90 - Extremely good line inf. They punch above their price when fighting in cities. The ASLAV-PC gets them wherever they need to be quickly and safely.

Support
Stormer - Fast Helicopter killer that can also shoot at vehicles and planes.
Rapier FSA - Longest range anti-plane defense you can get, has good accuracy at 60%.
Challenger Marksman - Blends in with tanks, providing very good and reliable helicopter defense. Accurate on the move and has 15 frontal armor.
AS-90 - 3-shot salvos of doom. Great at counter battery and sniping stationary targets. (including helicopters)
Bison 81mm - not nearly as glorious as it used to be, but it is very mobile and is good for smoke cover.

Tank
Chally 2 - Dat armor, dat gun.
C2 Mexas - Good mobile tank with above average armor and gun.
Chieftain mk11 - Good stationary tank that has the armor and gun to punch way above its weight.
Centurion mk5/1 - Because meatshield. The Aussie Centurion has a better machine gun than the otherwise-equal Canadian Centurion.

Recon
A22 Squirrel - Fast with Very Good optics, has 6 HP.
Recce - Have the longest-range sniper rifles and can kill lightly-armored vehicles. Use them on the flanks of your infantry.
NZSAS - Don't have the best LAW or LMG, but will shred infantry in close with the suppressed SMG. Accompany the front lines with them.

Helo
Lynx 3 - Tank killer with self-defense missiles.
Bushranger - CAS helicopter with AP rockets and dual miniguns.

Plane
F-111C - Grid removal.
Eurofighter - Versatile ASF that can hang with Su-27s.
Tornado F3 - Has 7000m on its SA missiles so it can get the jump on F&F ASFs. Has good ECM, I like bringing them with Eurofighters.
A-4k Kahu - Bane of Soviet Armored decks. Can kill any tank in the game in one pass and is surprisingly survivable.
Electric Voodoo - I use this as not only a cheap and effective SEAD plane, but also as an ECM meatshield. If I'm calling in an F-111C, these planes will come right before it.

Naval
Focuses on air superiority and anti-ship planes. The STRBs are very good river boats with 3x Elite veterancy but you have to micro them.