Hi, welcome to the forum. To answer your question, I guess it depends on how you intend to use it? If you're planning on subscribing to the Tape Project tapes, with a properly set up Otari 5050 series, Technics RS series, are both excellent machines. With the use of an playback amplifier upgrade, a machine that's running up to spec (this usually involves some repairs even if it was running perfectly when it was put into storage) the Tape Project tapes will sound better than any source outside of a better tape machine. Digital that I've heard really isn't even in the same ball park and there are a few upper tier vinyl sources that our members own that does come close, but we're talking about $20k+ vinyl front ends here.
When it comes to bang for the buck, it's going to be pretty tough to beat the Otari 5050 (there are several models out there with different features so doing a little searching will help you to decide which is for you). Take some time and try and get out and look at a couple (they come along on Craigs list fairly often) to know what you're looking at. Some can be pretty worn out from being used at radio stations but sometimes this is impossible to tell from the pictures on auction sites unless you know what to look for (razor slices around the headblock etc).
If you're totally new to magnetic tape, there's a "Beginners Guide" sticky at the top of the General forum that will help you to get a basic understanding. Another good resource for info is the Tape Trail forum on Audio Asylum. Doing a search for Otari both here and there will yield plenty of info to help you with a hunt.
As far as how these tapes will sound with a stock, well adjusted machine, I have to admit that mine was already modified when the first Tape Project tapes were released so I'll leave it to others to relate those impression to you. But, on the other hand, the changes I'd made were to wire the playback directly from the playback heads of my Technics to a modified Bottlehead Seduction. Total price for these mods were under $300.