Back in 1981 when your truly was really -really- young Texas Instruments released its early 16-bit computer: the TI99/4A; the follow up to the not particularly successful TI99/4 that improved on its graphics capabilities, added more than a few extras and shipped with a proper high quality keyboard. Having owned this wonderful machine for over 25 years, I just can't recommend it enough.
This TI99/4A bundle currently up for auction, seems like a great way to start your TI collection. You'll be getting the computer, 14 cartridges, 2 joysticks, the power cord, the RF adapter, the rare(-ish) Speech Synthesizer and quite a few manuals. Seller ships worldwide.