handles.
No handles means that dirty hands will always stain or mark your cabinets. There are some invisible handles that are grooved that can work.

For a more sleek look would you recommend no handles up the top and handles down the bottom ASVInteriors?

You mean upper cabinets no handles and lower cabinets with?
The design below has the groove handle I spoke to you off, the top handles are tip-on push to open cabinets.

Is your kitchen more traditional or modern?

I debated this issue as well and eventually went with no handles for the upper cabinets (instead the doors hang approximately 1.5cm lower and you open them by reaching "behind" the bottom of the door) and handles for all the lower cabinets.

I really liked the look of the shark nosed handles for the lower cabinets, but I was worried about dirty hands since the cabinets are white and I was also worried that crumbs, etc would end up falling into the cabinets and drawers.

That's what I'm worried about, so I'm not sure whether I should get the cabinets that you push, or go simple with handles or maybe a bit of both. My kitchen is quite traditional however we are renovating and starting over with a more contemporary look

I've just done my kitchen with all finger pull drawers and cupboards except for the pantry where it was not possible. My main reason was because of salt content in our air and its tendency to spot and corrode anything metal, but I definitely do not regret my choice at all. If I am going to be doing anything where my hands get wet or dirty, I just ensure everything is out before I start, but I would do that anyway as handles can get just as dirty and can be harder to clean.

The other downside to the finger pull drawers is that they are not waterproof, so any spillage can find its way into the drawer, but I've only had this problem once and as long as it is attended to immediately, there is no lasting damage.

Soft close doors and drawers were also a must as I have a deaf husband - I would have padded my bench top were it possible. The only problem with them is when visitors come to your home who aren't aware or don't understand and try to force things shut, this can damage the mechanism.

Any kitchen showrooms will have all the options for you to play with them too.

No handles.
1. Cheap handles start at around $10
2. Styles tend to change all the time, I can date a kitchen by the style of the handles.
Less is more!

In my opinion...

1. Overhead Cupboards:
- no handles gives more of a clean/streamline contemporary look
- no push/pull mechanism either (I personally think the click-clack noise is annoying)

I would suggest making the cupboard doors slightly longer (approx. 20mm) than the frame base for ease of pull-open, then you could also add soft-close mechanisms so you can just push-close without the door slamming (little round rubber pads on the frame would also work just as well)

2. Base Cabinets (btw you didn't specify doors and/or drawers??):
- no push/pull mechanism (for the same reason stated above)

- with handles, but in stainless steel is a must (not the cheap coated metal ones)
Pros: easy to open, no dirty finger marks on doors (particularly harder to clean if matt surface)
Cons: can't think of any, other than the look of the handles (but get nice ones... see the Block's Josh & Charlotte's kitchen handles... just wow, imo)

- without handles, but would highly recommend gloss surface
Pros: again clean/streamline contemporary look
Cons: dirty finger marks and food/liquid spillage into the gap

Either way your base cabinets, whether that be doors or drawers, should definitely be soft close... an extra cost, but one you certainly won't regret...

And if you do decide to go with no handles and if you can afford it (very $$) then check out: http://www.blum.com/au/en/01/60/20/

Good luck! :)