For 4 recreational dives/day (even 5) the lowest end computer will work fine. I have one and do that every trip.
Some of the really low-end have limited dive logging capabilities though - the Aeris XR1 NX has a 12 dive log. After that you will have to copy the data off or it will overwrite it. So you'd likely want to bring the download interface and a laptop also. The Puck has a 38
hour log. The Zoop has a 50
hour log.
LP also sells the Oceanic Veo 180 NX. It's a
previous model being closed out at $199. By setting the dive sampling rate, you can store as many as 150 dives before downloading. It also uses a download cable. Were you to buy one, I'd check that you can get the cable still also. And do so now.
Oceanic/Aeris are both owned by Hollis - who also sells dive gear. Some of their models are functionally identical so you might check for best price.
LeisurePro has the Zoop for $249. As mentioned Suunto charges about $80 for the cable. The Mares cable is $90 IIRC. Suunto's are also known to be more on the conservative side. I'm not a fan of 1 button computers so IDK anything about the Puck.
LeisurePro isn't an authorized Suunto dealer afaik so at that price you'd fall under
their equivalent warranty program. Which may mean your local Suunto dealer won't/can't service it. Or can provide warranty repair. Since you mentioned your dealer is significantly higher - he
is a authorized Suunto dealer - the Suunto online price is $300. If he's higher than that, buy it thru the Aqualung online store and have it shipped to him.
Instruments | Professional Diving Equipment
If you have an Oceanic/Aeris dealer nearby - LeisurePro is a licensed dealer also. So you could buy from them and have local warranty service. But their prices on Oceanic gear aren't usually that much better because they are.
Whatever you buy, if you buy the same brand - even different models, you'll likely both be diving the same algorithm so should have very similar results if you dive near each other. As an example, you could buy a Zoop and get your husband a Vyper. They're about $425 though. LeisurePro has them for $325. IIRC there's also several generations of Vyper's so be sure you're comparing the same model.
One other useful feature is water-activation. Most have it but some of the lower priced models may not. The Zoop does, IDK about any of the Aeris/Oceanic line.
Whatever you buy make sure the batteries are user-changeable also. I can't think of many that aren't except some of the older Mares models possibly still being sold like the Nemo(s).
---------- Post added June 10th, 2013 at 01:12 PM ----------
Just to help you spend even
lots more money - some of the AI models can read dual transmitters. So you could check his air from close by and vice-versa. Of course you'd both have to have one. And transmitters are pretty pricey also.