I'd listen to Daz (OrgasmDonor) as his advice is sage!!
I'm too impatient and always impulse buy!! It costs me a small fortune!!
It all depends on whether your building for show or building to ride!!
If your building for show then find a ride that holds some significance to you.
I for instance would love a Falcon Pro Theta as its the only complete BMX I ever had from new.
Then I had a Cali F+F for about 10 days and a PK ripper F+F for less than 2 months before I got my dream F+F of a Quadangle.
The Quad I had for 2 years but I stopped riding it after 6 months due to a shift from BMX to computers, woman and cheap Cider from the Offy!!
So the Falcon Pro Theta holds a special place in my heart because its the bike I had longest and its a bike I longed for as my parents really had to save to afford to get me that bike for Crimbo (times were hard).
If you want to ride a BMX or do some OS Racing then you really need a BMX you can actually ride (especially if you race it).
So if your lanky you might need something with a longer TT.
Whatever you decide, this lads on this site will give you any advice you need!!