Board Thread:Questions and Answers/@comment-98.243.3.60-20130827035331/@comment-53539-20130827185242

You can also get more opinions then what we're able to give here at places like Vocaloidism or Vocaloid Otaku forums. We tend to lean on the spread of information like facts on the software, whereas those places have guys which have hands-on experience with it and can often talk about it from a personnel experience.

Momoiro-sama hit most of the nails on the head... Other then vocaloid software you also need usually a DAW for creating music such as FL studio. All in all, a basic vocaloid + software set up will lean towards costing you something like $300+ USD. Its not cheap to get into this software and as Momo said, it depends on how serious your want to go into this.

Aside from Oliver, the only other english vocaloid sold as a starter package is Megpoid. Avanna is sold only as a "lite" version, which means you have to buy her separately... Kaito is another option but you'll end up with 3 Japanese vocals you won't be able to use unless you know Japanese, since english was a supporting vocal in his pack not a main.

Other then this, take note as you have of upcoming English vocals. We've got confirmed the ones remaining are English Miku (though the promises made by her vocal are quite disappointing), the Kagamines, there is also V3 Luka. Another vocal by Zero-G, likely male, and another by PowerFX after Yohioloid.

Also if you own the V3 software engine itself, all V2 vocals are able to be imported into it so this also gives you other options as well (they are more expensive though then V3 vocals overall).