Count Total on a limited query?

Hi group,

I've implemented a couple of search queries, to prevent too many results
transferring/getting displayed I use a LIMIT. Now I would like to
display the total numbers found on the query (discarding the limit).

Is this possible in a nice manner?
I thought up the following:
1. Implementing the limit system in PHP
Con: Too much work for something this elementary
2. Executing an extra search query which only counts
Con: An extra query which feels unnecessary
3. Using a subselect which only counts
Con: although it gives a nice result, and isn't much work, the query
will be executed for each record and therefore not an option.

I hope this can be done using PostgreSQL.

Thank you,
Koen Antonissen