There a couple of decent ones. It depends on pretty much what sizes you want to go with, weight limits, what tools do you often use and so on. There really hundreds of different multi tools from a half dozen great companies.
Some of my favourites.
Large ones:
Swiss Tool X. The thing has plenty of tools on it, the most corrosion protection I seen on just about any multitool. I don't like the lanyard hole on it mind you.
Leatherman Charge TTi. I love it. It has plenty of tools and useful abilities but has a screw driver with removable parts and not sure that ideal for service with the risk of loosing bits and the difficulty in replacing them. Lots of different mounting options on it too.
Leatherman Wave. Has most the features of the charge, not as grippy handle, but is much cheaper. Probably their biggest seller.
Leatherman Supertool. They are on the Supertool 300 now. It is a good heavy duty multitool with lots of nice mechanic type stuff that can be useful. Smaller package than say the TTi, but you loose some tools.
SOG Power Assist. Really nice tool. It has assisted opening blades on the outside which is a little overkill mind you, but has really strong pliers and is finely built. Great wire cutters on it.
SOG Powerlock is similar to the Power Assist but cheaper due to the lack of assisted opening and has all the nice features. They really have awesome pliers.
Smaller ones
Swiss Spirit X. Smaller, very nicely contoured and shaped for comfort and fairly light weight. Of course you get less ability, but it hard to beat the price/size/ability if you take it all into account.
Leatherman Juice. Similar size, lots of nice abilities. Well worth a look at.
Leatherman Squirt E4. Really tiny, small and I only use it because I don't drag around wire strippers with me to every repair on the equipment because I am too lazy. It actually a neat little design, though probably not what you are looking for.
Most Gerber ones I dealt with have had problems. The Suspension in particular is a nightmare and I just throw it into my telescope assembly bag. I don't think I would recommend one, though there was a time people liked the 600 series.
That's pretty much all I dealt with apart from some crumby no brands. Really to offer some good advice try and tell us a little what you are wanting on your tool, abilities wise and size wise.
SOG