Definitely a 2nd hand one!
Strats are a strange phenomena.... The place it was built and price dont always correlate to the quality so its usually a good idea to play one first (although I took my chances with ebay - and a got a good one for cheap).
In my opinion (and please, if you guys disagree, then im all ears!) the most fundamental and important part of the guitar is the neck, if you have a good neck then you are 90% of the way to having a potentially great instrument. The next thing is the join of the neck to the body and the allignment of the bridge. If those 3 things are tip-top, then you can put what ever pick ups you like, change the bridge, tuners, respray - whatever.
If you buy the american standard/deluxe you're also getting some nice sounding pick ups and better quality hardware, so keep that in mind. I bought a Jap strat (from 89-90 ish I think) which has Grover tuners - far better than the stock Fender tuners found on the American strats, but the pick ups were average at best.
I guess you can see where I'm going with this one, they are all different.
But, if it WERE my money, id probably go to a store that deals in 2nd hand strats (as in a store that sells a lot of em) and find a nice player from the mid 90's. Should get one for about $1300. Spend the other $200 on mods if you want them, or shout your better half a nice dinner, movie and ....something that rhymes with hand bag