If you want to participate in large scale events your going to have to have an IR tank. Good news is there are at least 3 Tamiya Compatiable systems in the works (see other threads for details) this should make it much easier for a HL tanker to get into the IR part of the sport.
( VS pro tanks are also an option)

I do however recommend that you start saving it may take a while to get the funds you need to do a Tamiya tank but it is worth it.

Also you should go to the events in your area meet and talk with the tankers see what they recommend. You may be able to test drive some tanks to see which one you like. Most clubs want new members and are happy to talk about thier tanks and share insights that will save you money long term.

Also you may find that this hobby is not for you. In which case your only out a few weekends. Once you have ~500 saved start watching eBay sometimes you can get a used tamiya tank at a good price even if some parts need replacing. Or from a local tanker for that matter.