This one does locks on. I just checked it. We've had it for a while and it is my favorite kitchen faucet ever. The spray is too powerful for me to leave on but may be Ok for you. It is great for blasting out the sink when cleaning it.

KOHLER K-13963-CP Elate Pullout Kitchen Faucet, Polished Chrome

Here is a link that might be useful: KOHLER K-13963-CP Elate Pullout Kitchen Faucet, Polished Chrome

Our faucet locks in spray mode, but it is a High Arc. It is made by Newport Brass and is the Jacobean model.

Here is a link that might be useful: Newport Brass Link

Kohler Forte

The Delta Pilar pullout locks on spray or flow; it's a high-arc faucet, but I imagine it's not the only Delta faucet with a locking pullout.

My Delta Leland faucet locks in spray mode...and it is high-arc.

It's a pullout not a pull down but my Rugby does that.

Here is a link that might be useful: Thread about the rugby faucet

Brizo Solna locks in the spray mode. Doesn't automatically reset when you turn faucet off either.

My 2 year old Kohler Karbon is in spray mode most of the time-until dh pushes a button and it streams. It does everything I could dream of and then more. It is articulating so it goes everywhere.

I have the blanco culina that locks into spray.

Thanks, all.... I'm checking them all out this morning!

The Waterstone 5300 and 5400 models will both lock in either mode and the faucet head will also lock in the home position and will never "dangle" like most do.

Kohler Vinnata and Brizo Solna both lock in spray mode.

I have a another Delta with a rocker switch for spray, so you can keep it on spray. I leave it there most of the time.

Here is a link that might be useful: Simple pull out Delta faucet

My Kohler Vinnata does, the spray works really nicely.

Kohler Simplice does. Forceful spray, too.

Brizo Venuto also locks in spray mode.

I have a Whitehaus Metrohaus. It is supposed to revert to normal flow after turning the water off, and, as delivered, it did. However, both lascatx and I have experienced that, within a month or so, it no longer does that. Instead, it stays on spray, like you want!

Comment on the Waterstone - you do have to engage it each time but it latches once engaged. WS is in the process of redesigning the head and I am waiting for one of the new ones - for now, I lost my head... OK - I have a different head that doesn't latch...
But I still love my WS!