bkrygier,
Generally women like things which are personal rather than expensive, sure a diamond ring works

but something nice and simple. This also helps so as the relationship gets better you can "get something" more extravogant
heres some tips:
1> work out your budget... bear in mind price is not an issue here
Things women like
1> Flowers
2> Choclates
3> Perfume
4> NICE underwear not trashy, and you will really impress her if you get her rght size, also a gift certificate is good
5> vouchers for a day out, makke-up, facial etc etc
6> personalised CD with nice songs
7> cuddly toys
and what I find always works is
1> leave little lovey dovey notes around (a treasure hunt around the house for a lot of little gifts
2> take her out for a nice romantic meal
3> SAY "YOU LOOK NICE" a lot,, also "I love you", "your beautiful"
(Women LOVE compliments but always say it like you mean it)
Dont fret the big stuf, thing small, sincere and personal.
A small $10 gift given with love and spirit is worth more than a diamond ring
trust me !