Like Drew said, it all depends on what you want to do..
Do you want to static fly/kitejump/scud, kitesurf, kitelandboard, or kitebuggy?
What's the area like where you fly? (beach? flat lands? hills? mountains?)
What are the winds like where you fly/plan to fly? (steady? gusty? what are avg speeds?)
For static flying/jumping/scudding a bigger 4-line foil will do nicely. A good step up will probably between a 4.5m-6.5m. A kite this size will
allow you to get moving in lower winds and you should still be able to hold it down in mid to high teens once your skills improve.
You mention static jumping, but then later ask about C-kites. C-kites are mainly used for kitesurfing, so were you thinking about riding on water?
Flying them on land is possible, but crashing (which beginners do a lot of) Bows/Cs on land can lead to leaky/popped bladders.
As far as Cs vs Bows:
Bows are more beginner-friendly, but that's not to say C-kites are 'no good' when compared to them. If you notice, all the top freestyle* riders are
riding C-kites: Aaron Hadlow on his Hadlow Pro, Ruben Lenten on his Fuel, Kevin Langree on the Naish Torch. I've read this is because of the way
C-kites turn, the way they loop, and because of the way they hang in the air after wakestyle moves (mainly load&pop tricks).
*I've seen far more bows used for kiteracing than Cs.
Bows usually offer more depower/easier relaunch/better safety than 4-line C-kites. But, 5th-line C-kites also offer more depower/easier
relaunch/better safety than 4-line C-kites. Some argue that 5thlines are safer than bows because of the way they flag out, and if you notice, Best
and Cabrinha are mimicking the 5th-line flagging with their Redline and IDS systems. If you're just starting out and really wanting to go with a C,
be sure it's a 5th-line at the very least.
Overall, the main thing I'd recommend is *taking lessons* before you move up to a bigger depower kite whether it be a C, Bow, ARC, or depowerable foil
(Flysurfer). You'll probably be taught on a Bow, but the control (steering/depowering) will be the same across all 4 designs. The things that will
differ between them is rigging, launching, relaunching, and landing.
Kites:
2012 TS 7,9,12/2007 Waroo 3,5/2009 Kahoona 9.5
Flexifoil Ion 2 8.5
HQ Hydra 350
Naish Helix 2, Cult 3,4.5
Ozone Zephyr 17m
Rides:
2011 Best Profanity 134, Cabrinha Kiteskate, Cabrinha Nugget, 2k9 Cabrinha Plasma 146x50, 2k9 Flexifoil Delta 139x41.5, 2011 Slingshot Darko 135x41,
Slingshot Scud, Tona wakeskate, Flexifoil Flexdeck, MBS Pro 90, MBS Ambush x 2, some oldskool buggy