A tube of Park grease is only, like, $7 if I recall correctly. It'll be good for all of your bearing grease needs on your bike. Just make sure the bearing races aren't pitted at all. A lot of times that happens if a bike is ridden with a loose headset. If your wheels haven't been serviced in a while either, it might be a good idea to go ahead and do the hubs while you're at it and Park grease is good for those too.