700 is a great deal for a new dell laptop in Costa Rica.
I just checked Dell online and their cheapest is 500 so why not get a trusted CRT guy to pick you up one and bring it down in his luggage? I'd do it for you, but I won't be back until around May.
500 is the basic system, but 549 buys you one with 512 of RAM instead of 256 so this is definitely the way to go - the extra 256 makes a big difference. I don't know what shipping will cost so it could amount to 600 when all said and done. Trouble with buying new and from the states though is that if anything bad happens to it, you are phucked! A cheap and used ebay laptop might be better - get someone to bring it to you.
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My last trip to CR (last week) I brought 2 unused cell phones and a laptop and gave it all to a chica (not a working girl) that works in one of the hotels we frequent. They really appreciate the cell phones if you have any, even the TDM phones, that you aren't using anymore.