At least 601 would be fine (although once I've settled on a course, that may drop significantly). I achieved 589 in the Christmas exams, but I'm only in fifth year so I'd take that with a pinch of salt. It certainly seems high, but in case I happen to decide to study in say, the UK (where conditional offers are very very high: this is the likes of UCL, Imperial, LSE, or possibly even Cambridge). But I don't want to take a gamble at one of these places since I really don't know if I'm smart enough (I'm laughably bad at English, for instance). Would definitely be leaning towards Science, Engineering, Actuarial Studies, TP/PM, or Memphis though. Depends how much I enjoy each LC subject, I guess.
naiomhmal, uncover the cheap little tricks used in each exam that's used to lower the H1/H2 rate etc. Exploit exams by uncovering patterns and discovering flaws in marking schemes and questions that you can abuse. It's not all intelligence and hard work. You also have to do is become the world's greatest spoofer (ie picking up marks as easily as possible).
Over 515, I'm going for a course that's 496 (Political Science and Geography in Trinity) but it's been going up consistently for the past few years. I'm afraid that it could jump by around 20 or 30 points because there's only 15 places.