Most reviews would go for an Intel, if budget isn't an issue.
The 80GB seems the most common amongst the current Intel's (G1 & G2's), but primarily due to price it seems. Of other drives, some use smaller, but many have indicated they'd prefer larger, if it were possible. It's going to come down to how much you actually need, so think on it carefully, before purchasing.
Also, you can RAID0 SSD's for additional capacity, and even speed (to an extent, as the ICH10R hits a wall at 650 - 660MB/s, no matter the drive count). Cost wise, it's very similar (MSRP at any rate, street is different ATM, due to limited supply) of a pair of 80's vs. a single 160GB model ($450 for the pair, $440 for the 160GB model).