I don't think the sensors you linked from Radio Shack are going to detect reflections from 10" away any better than the QTR sensors. We have been able to use the QTR-1RC
version to detect something up to around 8" away, but this was only when there was very little ambient IR hitting the receiver. The maximum recommended sensing distance listed on the sensor's web page is for getting a good analog measure of white and black surfaces (e.g. the maximum height you would want to mount it for a line following application). If you just want to know if a wall is in front of you, you can use it for much greater distances so long as:
1) the wall is sufficiently reflective. If it is a black wall, you won't see it well at all.
2) there is very low ambient IR. Ambient IR will cause your weakly reflected IR to be lost in the noise (just like it's much harder to see a candle flame several blocks away on a sunny day than it is to see that same candle on a dark, moonless night). For example, you wouldn't be able to see something 8" away with a QTR sensor in a room with a lot of sunlight streaming in through the window.
If you really want to see farther, you'll need a brighter IR source so that your detector has a better signal to see. You could achieve this by running more current through the LED, but this will cause the LED to burn out faster, or you could perhaps find a matched LED that can handle more current. Or you could consider getting a Sharp IR sensor
(note that this stops working for objects that are within a minumum distance of the sensor) or a sonar sensor
(this has pretty much no dead zone, but it can also see a lot farther than 10" so it might be overkill for your application).