as for type its personal preferance, for myself i LOVE Halfmoons, Delta Tails, Super Delta, etc - but i love me some veiltail as well. i would suggest, however, that you consider getting a 1-2.5g tank instead of a bowl. bowls are harder to heat and bettas need water that is around 78-80F or they get sluggish and sick. silk plants are prefered for them since their fins can get caught and rip on the plastic ones, likewise make sure any decorations you get do not have any rough edges :)
gender is also personal preferance, males tend to have the large tails and more color but i've seen some absolutely GORGEOUS girls too, just look at the display and find one that looks healthy and sorta 'calls to you', lol
you wanted pics of our bettas so here's a link to a thread with my kids' pictures in it
good luck on your betta hunt! keep us updated and post pics when you find 'the one!'