"V-shaped", also called "smiley eq" or "scooped mids", refers to the shape of an equalizer when you turn up the bass and treble and turn down the stuff in the middle. When someone calls a speaker "v-shaped" they mean that it sounds like it was EQ'd this way.
"V-shaped" makes the sound seem "wide" because of the emphasis on two opposite extremes and the big valley in the middle, but even though it makes you want to dance it's commonly avoided for recording and mixing applications. If you mix with a "v-shaped" speaker as a reference, your final track could end up with anemic bass and treble. "Pushed mids" is the opposite and looks like a frown instead of a smile. The ideal for recording is "flat". Hypothetically a perfectly flat speaker wouldn't molest the sound at all, but perfect flatness doesn't exist.
That's not as much of an issue in electronica since you don't have separately recorded instruments and mics fighting over space in the mix and generally hear exactly that the end-listener would hear from the start, but you still have to be careful.
My Shures and M-Audios both walk a thin line between being accurate enough to record with and having artificially "woofer-like" bass, but they're each in the $150 range. Maybe the SRH440 ($70) would be worth a look.
