You can fit all of them. Period.
What's your primary?
Spines, no i can't really. well i can fit resilience at 49.
I didnt bother with kick or tough. I originally had fighting, then speced it out for fitness and haven't looked back. only pools i have are fitness and jumping, and (so far) focussed accruacy from body mastery (will take Conserve Power at 49, though).
@Willow R
Main Hero:
Willow R (Emp/Rad Defender, lvl 50)
Matakoshi (kat/regen Scrapper, lvl 50)
post a build and we can advise better 
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[ QUOTE ]
Spines, no i can't really. well i can fit resilience at 49.
[/ QUOTE ]I could fit them all in with my spines, although resilience was at 49.
i could fit them all but i want laser beam eyes and energy torrent and focused accuracy. im levle 37 right now and the powers i got are,
lunge
spine burst
impale
build up
quills
ripper
throw spines
Swift
health
stamina
Combat jump
super JUmp
Fast healing
quick recovery
reconstruction
dull pain
Instant Heal
intergration
and kick
I want focused accuracy, laser beam eyes, and energy torrent
that leaves me with 2 more powers to get. I'll respec the travel power and go for speed with hasten when issue 7 hits.
What is best for leveling up in pve. Kick+ tough vs resilience and mog, i cant fit all of them.