I mostly do CP, but also do the occassional batch of HP when I have an ornery fragrance that just won't behave well in CP, and I just wanted to let you know that any recipe that you do CP with can also be HP'd perfectly fine.
The only thing you want to make sure to do differently with HP is use the full water amount (no water discounting).
HP usually comes out looking more rustic looking compared to CP, but you can get a smoother look (and pour) to your HP by adding 1 tbsp. ppo of either sugar and/or sodium lactate to your lye water. I actually add both to mine and it makes my HP pour much smoother and makes the finished soap look more CP-like and less rustic. You can add one or the other instead of both and still get a smoother result than without, but I add both because SL and sugar are already regular staples in all my recipes for other reasons.
There are different methods of doing HP, too. Some do it in a crockpot, some do it in a double boiler, some do it on the stovetop, and some people (like me) do it in a big pot in the oven. Which method have you been using?
Extracts and flavorings are not specially formulated for soapmaking and so they more than likely won't survive the saponification process intact. I used a flavoring oil once and it morphed and faded in my soap. It's best to stick to those EOs and FOs that are rated to be skin safe and that also have been tested and/or formulated for use in soap, otherwise you could be throwing your money down the drain. There are lots of good fragrance and colorant suppliers to choose from that sell to homecrafters, and like Tabitha said, you can also check for sales on the forums.
Some of my favorite suppliers are:
http://www.wholesalesuppliesplus.com/
http://www.oregontrailsoaps.com/
http://www.thesage.com/
http://store.scent-works.com/
http://www.candlesupply.com/
http://www.sweetcakes.com/
http://www.peakcandle.com/
http://www.daystarsupplies.com/
And I also like to check over on this place first before buying any fragrances. It's a fragrance review site where people can write in and tell of their experiences with a fragrance, good or bad, and how it behaved in soap (I think you have to register first, but it's free):
http://soapscentreview.obisoap.ca/
HTH!
IrishLass