i have two Sanwa JLWs in my 4 player panel(for players 3 and 4) and i really like the feel of them...so much in fact that i think i am going to pull my u360s out and replace them with two more JLWs. they are a little short if straight bottom mounting, i used a router to reduce the thickness of the panel where the joysticks mount. they are still bottom mounted, but it made them feel better. they aren't too expensive and feel great. plus the u360s are modified JLWs (at least they used to be) so if you decide to switch later, they should just drop right in.
they have a square restrictor on them, which makes them feel alot different than a happ stick, but they feel good. also, due to the square restrictor, it is easy to hit diagonals, which makes them work very well for Qbert.
i'm not aware of any 8way balltops designed for wooden panels.