I'd suggest a compromise. 10 hours is a bit soon to be leaping between types but don't miss the opportunity to get a seat in as many aircraft as possible, perhaps as part of your club or school's training activities with other pilots. For example, despite being (then) a fairly slender student learning in a C-A150, I formed part of many a load check in other aircraft. The back seat in navexes was another good spot.
When you've reached RPL/GPFT/... standard, you can realistically look at some conversion training. If you move to a C172, the conversion is minimal, with perhaps a little bit more time needed for a PA28 etc - mainly to familiarize yourself with systems and handling differences. By this time you have the basics under control and the extra experience is wholly positive.