you can get pretty cheap finders that have temp included, but you have to step up quite a bit to get one that will show speed, and all the ones ive seen take a second sensor for the speed. Im not sure about price, but i think any with speed are around $300 minimum. good luck, Brian
For a really great finder. get the eagle 480 i think. does gps mapping and gps speed. thing with speed is gps is acurate at high speeds and water sensors aren't but are for the opposite. paid about 300 or so from cabelas but got it on sale and got a deal on shipping. would be a lot better if i upgrade for somewhere around 70 is or so to the better maps. paid another 80 for the water speed sensor but out of the box it does speed over land(gps). ver yhandy tool. worth saving up and investing. i had a 100 huminbird on my other boat and sure it helped as a fishing tool but never liked it. wasn't worth the time to take it off when i sold the boat.
Also, I was told by the guy at Sportsman's that, by far, Humminbirds were returned most often due to defectiveness. He even went to far as to tell me that he had pulled several out for display models that failed to function. If you think about how seldom display models are put up that's really a terrible sign. He also said that even ones which worked had bad seals that would allow the screen to develop condensation, terminals would become corroded etc.. Very poorly made in his opinion.
Just for kicks I will use the Luhr Jensen when trolling and I have to admit it is very accurate in speed. In a lake it is right on the money with my GPS speed. In the river it will vary depending how strong the current is. It is a cheaper way to go if your only worried about trolling speed.
I have owned four Humminbirds over the years...great units. My advice is spend the extra 100.00 and get the COLOR upgrade, worth 1000.00; if you are a troller I recommend the two or three D units it allows you to know when to turn before you leave the channel.
Cabelas is having a sale at this moment...and yes the 2D color model with GPS is on sale...!!!!