Here's my 2 cents. Deciding between upgrading from the 740 to a Tyros or a PSR2100, is really dependent on one's personal playing style requirements. They both offer distinctly different advantages. If you require a super light EZ to transport keyboard with built in speakers, the PSR2100 may be the better choice. The 2100 offers 2MB vs 3 MB on the Tyros, but if you are content utilizing the kb's internal styles, 2 MB should sufficient to hold enough custom user styles to keep you happy. The PSR2000 only has 1 MB of user memory. The PSR2100 also includes many of the Tyros's new improved styles & sounds (except for the mega voice variety). The PSR2100 also includes USB connectivity. The main advantages of going with the Tyros over the PSR2100 (imho) is that the Tyros keyboard construction & feel is much improved, and the arranger function buttons are much larger & are illuminated (easier to read) and the bright color LCD screen and much larger character font size make it much easier to navigate. The Tyros also allows you to select any of the 3 intros/endings directly from dedicated buttons vs having to go into a sub menu on the PSR2100/2000. Another often overlooked feature that the Tyros has which both PSR2100/2000 don't, is a dedicated physical 'reg bank' button to call up Registrations files from any mode, such as while you're in Music Finder. The PSR2000/2100 don't allow you to do this. This (to me) is a serious limiatation. The other critically important Tyros advantage (for me) is that it supports 3 individual foot controllers vs only 2 on the PSR2100/2000. I need to assign one for sustain, another to trigger the vocalizer/or Reg Memory advance, and the 3rd to trigger fills. Another Tyros convenience (but not essential) is having the mic level setting conveniently located next to the master volume knob, whereas the PSR2100/2000 mic level is awkwardly placed at the back of the kb.

One complaint I have about the Tyros is it is a bit inconvenient (hassle) to have to drag along the Tyros speakers (with sub woofer) to gigs, personal monitoring, but I suppose it's a trade off to get a lightweight kb (27 lbs). The total weight of the Tyros KB & the Tyros speakers is still less than the 9000pro or PSR9000, so I suppose its easier to carry two pieces (keyboard + speaker system) than a single heavy kb.

I own BOTH the Tyros and the PSR2000 and utilize each keyboards for DIFFERENT situations. For casual spontaneous parties & gigs , I'll take the PSR2000 because it's so quick and ez to grab and go. For longer gigs and larger 'all evening' events, I prefer to take the Tyros as it offers improved sounds/styles, better arranger on the fly navigation, greatly improved keyboard feel (action) which = improved playing musical expression. In the end, it seems the audience is happy with whatever keyboard I use. Hmmm. after saying all that, I may consider adding a PSR2100 now.

Scott