I completely agree with buying the gear first... especially a good jacket, and helmet.
Remember to get a motorcycle specific jacket, whether leather, or textile, you want something that will hold up in a crash... Most department store leather jackets will shred to pieces in just a few feet when sliding down the asphalt.
The jacket should be tight, but fairly comfortable... remember that it will break in as you wear it, a decent motorcycle jacket will probably cost you anywhere between $250 and $500.
Depending on the riding you do, and yer budget, you might want to look into an Aerostitch suit. They are Cordura suits, that have lots of pockets, armor, and are quite comfortable. (So I hear- I don't own one)
You ask about brands, I would recommend... First Gear, Hein Garicke, Joe Rocket, Dainese, Teknic, IXS, Spidi, Kushitani... and more that I'm sure I'm forgetting.
Boots... If you can afford a good set of motorcycle boots, I would go with a pair by Sidi, or Alpinestars.
Helmets... get one that fits a little snug, as it will break in as well... Get used to wearing earplugs under it as well (we don't want you to lose hearing) I recommend a full face. Right now I wear an Arai Quantum/f Haga replica. I used to have a Shoei RF-R...
"You face forward, or you face the risk of shock and damage!" -Brodie Bruce