For domain registration I use 1and1.com which is $5.99 and they are ICANN registered and are quite good.

For hosting I have heard a great deal of complimentary things about chilihost here at GWW so I'd take a look there.

directNIC is too expensive for me as I can get 2 for the price of 1 and haven't had any problems with 1and1 who also do hosting but I couldn't say if they accept adult.

hth
Ian