Shannon - why not go with a flip-flop hub, then you can get used to SS first (i.e. stop thinking about gears, allows you to concentrate on traffic / peds), then if you feel ok go to fixed (think about pedalling action, road positioning, cadence etc). Fixed is very "pure", but it's not for everyone..

then obviously from there you can progress to arrospok hipster-land (wearing impossibly tight rolled up jeans and comedy cycling cap on your lo-pro stup, where even if you look up as far as you can you might be able to se the front of your wheel...:-)