If you don't handload or have plenty money to purcahse good 10mm ammo, then 10mm is probably not for you, if you intend to shoot alot.
Ballistically the 10mm when loaded to the higher performance levels can be very effective.
The RIA 10mm is 1911 copy with some tweeks...if you find it on the heavy side you might want to consider the Glock 29...
However, just be WARNED! 10mm is ADDICTIVE...Nobody can have just one!