rare or better silver-fed (p2w item) and salvage cheap exotic armor and trinkets by buy ordering for 25 silver. Use black lion salvage kits when you get them and look for exotics that are below 1g. Also, exotics should be lvl 68 or higher. Buying from TP seems the best option.
For sPVP you don't need to boost, as you will get boosted automatically to level 80 there. You will also get special equalized gear within the PvP section of the game. In WvW you will be scaled up. This upscaling doesn't work too welll though, but you still don't really need to use the level 80 boost.

Mostrando o que fazer depois de pegar o lvl 80, para quem TEM as expansões!Vídeo Level 80 Conta FREE:

The advice to avoid lvl 80 boosts is because a lot of people (and we mean A LOT of people) jump in from FPS or solo RPGs, boost to lvl 80, join in on Dungeons, Fractals and Raids. They don't know how to dodge, don't know how their weapons or traits work and really do ruin the experience for everyone.

The Level-80 Boost is an item awarded to players who purchase Guild Wars 2 expansions. This awarded item comes bundled with various items and a free shared inventory slot , and allows underleveled characters to preview max-level play before committing to consuming the boost. Step 1: Preparations. There are a number of things you need before getting your first Guild Wars 2 mount. Some are optional, others are required. Here are the things you need: It’s possible to get a Raptor if you are not level 80. In order to do so you need a friend of a guildie to carry you through this process. hzwXN. 10 335 23 278 294 462 301 211 189

guild wars 2 buy level 80 boost