I'm looking for a good second nitro rc plane.i had a hobbico nexstar.I want to purchase either the futaba 9caps PCM transmitter or the JR 7 channel pcm transmitter.I thought of purchasing a low wing plane.I've considered the sig four star 120 and the great planes cherokee.Which one of these two do you suggest? Any other suggestions?I want a plane with at least a 60 -65 inch wingspan though I'd prefer a plane w/ a 70 plus inch span.I'm somewhat budget minded.Any tips are appreciated Thanks.

Budget minded?
There is a huge difference between the 4 Star 120 and the Cherokee.
The 4 star 120 is a 120 size airplane while the Cherokee is a 40 size
The 120 size plane will cost you 3 times what the 40 size plane will cost to get in the air.
Have you considered the 40 or 60 size 4 Star?

i have trouble seeing small planes in the air especially on a sunny day.The sig 40 is too small but the 60 might work

Here's your solution, CLOUD DANCER 60 by Ace Hobbies. Low wing, tail dragger (I added landing gear under fuse...what you normally see...instead of in the wings). I always get compliments and the plane flies great...so stable and fast with an OS .91fx in it. It'll make you look like a pro.

Don't forget about the Tiger .60 from Goldberg. It comes as both a kit and an ARF. The wingspan is in the range you are looking for and they say it makes an excellent #2 plane.

ARF or kit build? Many of the Stik variations would be good (but not the Goldberg Hot Stik or Wild Stik). The Kangke SK-50 is a honey of an ARF with a TT Pro-46 or S.T. 51 engine. And the good 'ol Sig Four Star is always the right choice.

With any of these you might want to ask an exprienced pilot to maiden them and get the initial trim done. You want a second plane, not a ten second plane.

At that scale, the larger plane will make not one iota of a difference!

5-10 feet further out the larger plane will look exactly the same as the smaller one.... and 10' is not a big distance.

Get either, although the .40 size is really fine, and learn to fly them closer in to you if you are having difficulting seeing them.

Also put loudly colored strips of different colors on the wings and tail to help you maintain orientation.

Work on being able to tell the orientation of the plane by how it flies, and not by actually seeing it. In other words, if the plane is a dot in the sky, you should still be able to tell which way it's pointed and going by the way it responds to your inputs.

Simulators are fantastic for this, particularly the more advanced ones. By turning on smoke trails in the sim you get an aid that helps you obtain your bearings as you practice shoving the "dot in the sky" around.